Is the Devil a real being who may be worshipped?
The only devil worship that the Bible speaks of is the worship of idols
Leviticus 17:2 Speak unto Aaron, and unto his sons, and unto all the children of Israel, and say unto them; This is the thing which the Lord hath commanded, saying, 3 What man soever there be of the house of Israel, that killeth an ox, or lamb, or goat, in the camp, or that killeth it out of the camp, 4 And bringeth it not unto the door of the tabernacle of the congregation, to offer an offering unto the Lord before the tabernacle of the Lord ; blood shall be imputed unto that man; he hath shed blood; and that man shall be cut off from among his people: 5 To the end that the children of Israel may bring their sacrifices, which they offer in the open field, even that they may bring them unto the Lord , unto the door of the tabernacle of the congregation, unto the priest, and offer them for peace offerings unto the Lord. 6 And the priest shall sprinkle the blood upon the altar of the Lord at the door of the tabernacle of the congregation, and burn the fat for a sweet savour unto the Lord. 7 And they shall no more offer their sacrifices unto devils, after whom they have gone a whoring. This shall be a statute for ever unto them throughout their generations.
Deuteronomy 32:16 They (Israel) provoked him to jealousy with strange (foreign) gods, with abominations provoked they him to anger. 17 They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up, whom your fathers feared not. 21 They have moved me to jealousy with that which is not God; they have provoked me to anger with their vanities: and I will move them to jealousy with those which are not a people; I will provoke them to anger with a foolish nation.
These idols were not real gods, they were inventions of men. Israel worshipped the idols of the Canaanites which involved the sacrifice of children.
Leviticus 18:21 And thou shalt not let any of thy seed (children) pass through the fire to Molech, neither shalt thou profane the name of thy God: I am the Lord .
Leviticus 20:2 Again, thou shalt say to the children of Israel, Whosoever he be of the children of Israel, or of the strangers that sojourn in Israel, that giveth any of his seed unto Molech; he shall surely be put to death: the people of the land shall stone him with stones. 3 And I will set my face against that man, and will cut him off from among his people; because he hath given of his seed unto Molech, to defile my sanctuary, and to profane my holy name.
Solomon, influenced by his wives in his old age, set up idol worship
1 Kings 11:7 Then did Solomon build an high place for Chemosh, the abomination of Moab, in the hill that is before Jerusalem, and for Molech, the abomination of the children of Ammon.
King Ahaz sacrificed his children to idols
2 Chronicles 28:3 Moreover he (Ahaz) burnt incense in the valley of the son of Hinnom, and burnt his children in the fire, after the abominations of the heathen whom the Lord had cast out before the children of Israel.
As did Manasseh
2 Chronicles 33:6 And he (Manasseh) caused his children to pass through the fire in the valley of the son of Hinnom: also he observed times, and used enchantments, and used witchcraft, and dealt with a familiar spirit, and with wizards: he wrought much evil in the sight of the Lord , to provoke him to anger.
Jeremiah 7:31 And they (Judah) have built the high places of Tophet, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I commanded them not, neither came it into my heart.
Jeremiah 32:35 And they (Israel and Judah) built the high places of Baal, which are in the valley of the son of Hinnom, to cause their sons and their daughters to pass through the fire unto Molech; which I commanded them not, neither came it into my mind, that they should do this abomination, to cause Judah to sin.
Psalm 106:36 And they served their idols: which were a snare unto them. 37 Yea, they sacrificed their sons and their daughters unto devils, 38 And shed innocent blood, even the blood of their sons and of their daughters, whom they sacrificed unto the idols of Canaan: and the land was polluted with blood. 39 Thus were they defiled with their own works, and went a whoring with their own inventions.
Isaiah describes the stupidity of idol manufacture
Isaiah 44:8 Fear ye not, neither be afraid: have not I told thee from that time, and have declared it? ye are even my witnesses. Is there a God beside me? yea, there is no God; I know not any. 9 They that make a graven image are all of them vanity; and their delectable things shall not profit; and they are their own witnesses; they see not, nor know; that they may be ashamed. 10 Who hath formed a god, or molten a graven image that is profitable for nothing? 11 Behold, all his fellows shall be ashamed: and the workmen, they are of men: let them all be gathered together, let them stand up; yet they shall fear, and they shall be ashamed together. 12 The smith with the tongs both worketh in the coals, and fashioneth it with hammers, and worketh it with the strength of his arms: yea, he is hungry, and his strength faileth: he drinketh no water, and is faint. 13 The carpenter stretcheth out his rule; he marketh it out with a line; he fitteth it with planes, and he marketh it out with the compass, and maketh it after the figure of a man, according to the beauty of a man; that it may remain in the house. 14 He heweth him down cedars, and taketh the cypress and the oak, which he strengtheneth for himself among the trees of the forest: he planteth an ash, and the rain doth nourish it. 15 Then shall it be for a man to burn: for he will take thereof, and warm himself; yea, he kindleth it , and baketh bread; yea, he maketh a god, and worshippeth it ; he maketh it a graven image, and falleth down thereto. 16 He burneth part thereof in the fire; with part thereof he eateth flesh; he roasteth roast, and is satisfied: yea, he warmeth himself , and saith, Aha, I am warm, I have seen the fire: 17 And the residue thereof he maketh a god, even his graven image: he falleth down unto it, and worshippeth it, and prayeth unto it, and saith, Deliver me; for thou art my god. 18 They have not known nor understood: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand. 19 And none considereth in his heart, neither is there knowledge nor understanding to say, I have burned part of it in the fire; yea, also I have baked bread upon the coals thereof; I have roasted flesh, and eaten it : and shall I make the residue thereof an abomination? shall I fall down to the stock of a tree?
In the New Testament the nations such as the Greeks and Romans worshipped idols. The idols, described as 'devils' (Greek ‘demons’), were false gods and Paul warns Christians not to become involved in idol worship.
1 Corinthians 10:18 Behold Israel after the flesh: are not they which eat of the sacrifices partakers of the altar? 19 What say I then? that the idol is any thing, or that which is offered in sacrifice to idols is any thing? 20 But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils. 21 Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils.
Paul tells us that an idol is 'nothing in the world' (RSV 'has no real existence')
1 Corinthians 8:1 Now as touching things offered unto idols, we know that we all have knowledge. Knowledge puffeth up, but charity edifieth... 4 As concerning therefore the eating of those things that are offered in sacrifice unto idols, we know that an idol is nothing in the world, and that there is none other God but one. 5 For though there be that are called gods, whether in heaven or in earth, (as there be gods many, and lords many,) 6 But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him. 7 Howbeit there is not in every man that knowledge: for some with conscience of the idol unto this hour eat it as a thing offered unto an idol; and their conscience being weak is defiled.
1 Corinthians 12:2 Ye know that ye were Gentiles, carried away unto these dumb idols, even as ye were led.
Punishment upon idolators is prophesied in Revelation.
Revelation 9:20 And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:
From this we see that 'devil' worship in the Bible is the worship of idols, the work of men's hands.
The ‘Devil’ (Greek ‘diabolos’) used as a personification for the propensity to sin within man is not the subject of worship in the Bible.
John 8:44 Ye are of your father the devil, and the lusts of your father ye will do...
1 John 3:8 He that committeth sin is of the devil...
For information on this devil, may I suggest that you read:
The Devil: http://www.thisisyourbible.com/index.php?page=library&task=show&mediaid=31
Do you believe in a Devil? http://www.thisisyourbible.com/index.php?page=library&task=show&mediaid=162
If you then have further questions please ask.
I hope you have found this helpful.