Apostle Paul addressed this matter when he warned about divisions and contention happenning among the Churches in his day. In 1 Cor.1 he admonished us to all speak the same things (i.e., same doctrine).
1 Cor 11:17-19
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.
(KJV)
That last verse above should be an eye-opener. In Galatians 2 Paul warned about false brethren unawares brought in.
1 Cor 3:1-15
1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ.
2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.
Because of strife by those who were yet carnal, Paul couldn't impart the "strong meat" (Heb.5:12), but instead only the "milk" of God's Truth, which is for babes. Imagine giving an infant steak to eat instead of a bottle of milk. So there's a milk level understanding in God's Word, and then there's a strong meat level understanding in God's Word. The strong meat is about the "spiritual" understanding of God's Word and can go deep. Our carnal nature will prevent its understanding if we follow our carnal nature.
3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
4 For while one saith, "I am of Paul"; and another, "I am of Apollos"; are ye not carnal?
5 Who then is Paul, and who is Apollos, but ministers by whom ye believed, even as the Lord gave to every man?
That's still happenning today in Christ's Church. It's what following men's traditions involves ("Well I go to this Church and believe this way", and another says, "Well I go to this Church and believe that way..."). All that's a working of the carnal nature. It will always be of strife and confusion, creating chaos. That's also the nature false brethren unawares brought in use to create divisions in Christ's Body.
6 I have planted, Apollos watered; but God gave the increase.
7 So then neither is he that planteth any thing, neither he that watereth; but God That giveth the increase.
It all boils down that following men is a carnal work, for only God can give us understanding and true guidance. His servants are only laborers in the field that plant and water.
8 Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour.
9 For we are labourers together with God: ye are God's husbandry, ye are God's building.
10 According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon.
11 For other foundation can no man lay than that is laid, which is Jesus Christ.
12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
13 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
14 If any man's work abide which he hath built thereupon, he shall receive a reward.
15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
(KJV)
The only true foundation is Christ Jesus. Each believer's work will be tried to show of what sort it is, and that's what each believer's rewards will be based on, because our works in Christ Jesus follow us to Heaven (Rev.14:13).