we have thousand of denominations due to division. Leaders have their 'own' understanding and opinions after they read the bible. It's sad I think it's how the Lord want it to be done. If you read the church history all the way up to now, you'll see godly servants of the Lord broke from their origin church and start their own denomination, some turned out to be good and some became really bad, in short no perfect church. Well it's sad and hard to swallow to see so much division for someone who's new to the faith but it's the reality.
I personally believed God is in charge of this, until Jesus's 2nd coming it will stay what is it, what do you think?
(different groups or churches is challenging to a new believer, he might ask 'so which church/community should I go to?')
The Advance of the Gospel
Php 1:12 But I would ye should understand, brethren, that the things which happened unto me have fallen out rather unto the furtherance of the gospel;
Php 1:13 So that my bonds in Christ are manifest in all the palace, and in all other places;
Php 1:14 And many of the brethren in the Lord, waxing confident by my bonds, are much more bold to speak the word without fear.
Php 1:15 Some indeed preach Christ even of envy and strife; and some also of good will:
Php 1:16 The one preach Christ of contention, not sincerely, supposing to add affliction to my bonds:
Php 1:17 But the other of love, knowing that I am set for the defence of the gospel.
Php 1:18 What then? notwithstanding, every way, whether in pretence, or in truth, Christ is preached; and I therein do rejoice, yea, and will rejoice.
Even back in the beginning of the Church there were what we would call Division, but Paul said it differently, he understood the Power of God through the Holy Spirit working in the hearts of men.
It's not a belief in some Denomination or another, it's only the Belief that Jesus died for your sins, and that you are Baptized into His death unto Newness of Life in the Holy Ghost.
1Co_2:2 For I determined not to know any thing among you, save Jesus Christ, and him crucified.
Paul was saying, I don't care what Denomination you want to call yourself, but that we should all understand that Jesus is the Head of the Church and "WE ARE" that Church, regardless of Denomination.
Jesus knew how things would be, telling them how things would transpire.
Mar 9:38 And John answered him, saying, Master, we saw one casting out devils in thy name, and he followeth not us: and we forbad him, because he followeth not us.
Mar 9:39 But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me.
Mar 9:40 For he that is not against us is on our part.
Mar 9:41 For whosoever shall give you a cup of water to drink in my name, because ye belong to Christ, verily I say unto you, he shall not lose his reward.