If we all believe in the same Bible, what caused a split in the religion?
Why you are so concerned about so many different denominations in Christianity?
Have you not heard this :
And Christ is before all things, and in Christ ALL THINGS HOLD TOGETHER. -Colossians 1:17
So, the more important question is are the different denominations or non denominations are in Christ or united in Christ or in union in Christ !
If the denominations or non denominations are not in Christ, they just need to repent and the blood of Christ cleanse them from all unrighteousness. For the Lord Jesus Christ is still working mightily to prepare His church, as we have heard:
Consequently, Christ is able to save TO THE UTTERMOST THOSE WHO DRAW NEAR to God through Him, since He ALWAYS LIVES TO MAKE INTERCESSION for them. -Hebrews 7:25
So those who under different denominations or non denominations who draw near to God through Christ, Christ lives to make intercession for them.
So why you are considering that there is a split ?
Remember what have been spoken:
Now there are varieties of gifts, but the same Spirit; -1 Corinthians 12:4
and there are varieties of service, but the same Lord; -1 Corinthians 12:5
and there are varieties of activities, but it is the same God who empowers them all in everyone. -1 Corinthians 12:6
So the different denominations or non denominations with different activities who draw near to God through Christ are empowered by the same God; there may be different services in the different denominations or non denominations but the same Lord; there may be different gifts in the different denominations or non denominations but the same Spirit.
Therefore, there is no split or division in the body of Christ!
All Scripture in the Bible is God-breathed that is words taught by the Holy Spirit expressing spiritual truth in spiritual words because they are spiritually discerned. ( 2 Timothy 3:16; 1 Corinthians 2:13).
All the different gifts, services and activities in Christ are empowered by one and the same Spirit, who apportions to each one individually as the Holy Spirit wills. (1 Corinthians 12:11)
Are judging the Holy Spirit that the Holy Spirit cannot empower different denominations or non denominations with different activities, services, and gifts in Christ?
Remember that:
For we were all baptized by ONE SPIRIT INTO ONE BODY–whether Pentecostal, Baptist, Methodist, or any denominations or non-denominations –and we were ALL GIVEN THE ONE SPIRIT to drink.
(1 Corinthians 12:13)
That Body is the Body of Christ, so there is no split or division.
Remember also what the Lord has spoken:
Whoever believes in the Son has eternal life;
whoever DOES NOT OBEY THE SON shall not see life, but the WRATH OF GOD REMAINS ON him.
So those under any denominations or non-denominations, who does not obey the Son; the wrath of God remains on them.
Just as what the apostle Paul have said, too :
So too at the present time there is a remnant, chosen by grace. -Romans 11:5
Therefore, there will be only a remnant chosen by grace from any denominations or non-denominations.