Does it matter what we believe so long as we believe?
The meaning of faith is belief.
Biblical faith is belief in the promises of God as revealed in the Bible.
Hebrews 11:6 But without faith (belief) it is impossible to please him: for he that cometh to God must believe that he is, and that he is a rewarder of them that diligently seek him.
The source of faith is therefore the word of God as found in the scriptures.
Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.
2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17 That the man of God may be perfect, throughly furnished unto all good works.
From this we see that Biblical faith is not blind faith.
Faith must be a product of reason.
1 Peter 3:15 But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear:
Faith or belief that the Bible is the word of God is based on its internal integrity and the fulfilment of Bible prophecy in secular history.
If we believe God’s promises, then we will live a life that is acceptable to him.
What we do is a product of what we believe.
We therefore work the works of faith, without which faith is dead.
James 2:20 But wilt thou know, O vain man, that faith without works is dead? 21 Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar? 22 Seest thou how faith wrought with his works, and by works was faith made perfect? 23 And the scripture was fulfilled which saith, Abraham believed God, and it was imputed unto him for righteousness: and he was called the Friend of God. 24 Ye see then how that by works a man is justified, and not by faith only.
God requires us to believe (have faith in) the gospel preached by his Son Jesus Christ.
If we believe, repent of our sinful way of life, are baptised into Christ for the remission of past sins, and try to live by Christ’s commandments, God has promised that our belief (faith) will be counted for righteousness.
Romans 4:20 He (Abraham) staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God; 21 And being fully persuaded that, what he had promised, he was able also to perform. 22 And therefore it was imputed to him for righteousness. 23 Now it was not written for his sake alone, that it was imputed to him; 24 But for us also, to whom it shall be imputed, if we believe on him that raised up Jesus our Lord from the dead; 25 Who was delivered for our offences, and was raised again for our justification.
If our faith is counted for righteousness, we will be raised from the dead to eternal life in the kingdom of God when Christ returns.
I hope you find this helpful.