"Why are there divisions in Christianity?"
"For there must also be factions among you, that those who are approved may be recognized among you."
1 Cor. 11:19
You are funny...taking a verse out of context...Paul is writing to a group in Corinth, not the whole body of Christ.And he is speaking against divisions...
Titus 3:10
A man that is an heretick after the first and second admonition reject;
Ephesians 5:11
And have no fellowship with the unfruitful works of darkness, but rather reprove them.
17 Now in this that I declare unto you I praise you not, that ye come together not for the better, but for the worse.
18 For first of all, when ye come together in the church, I hear that there be divisions among you; and I partly believe it.
19 For there must be also heresies among you, that they which are approved may be made manifest among you.
20 When ye come together therefore into one place, this is not to eat the Lord's supper.
21 For in eating every one taketh before other his own supper: and one is hungry, and another is drunken.
22 What? have ye not houses to eat and to drink in? or despise ye the church of God, and shame them that have not? what shall I say to you? shall I praise you in this? I praise you not.
"Let both grow together until the harvest, and at the time of harvest I will say to the reapers, “First gather together the tares and bind them in bundles to burn them, but gather the wheat into my barn."
Matt. 13:30
That parable is about the world, not the church. It is explained in the chapter. Wheat and tares grow together in the world, not in the church.
this is the church...
14 Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?
15 And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?
16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people.
17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you.
18 And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty.
He knows who are His and, I believe there are some "of His" in all denominations. Men squabble and cause division within but...that can be a good thing too if they are defending sound doctrine filtered through scripture.
That is rubbish, God does not sanction denominations,,, All believers must speak the same thing... If there are some oh his in any denomination he urges them to come out...
17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you.