Is there a Biblical basis for the division caused by various theologies?
Let us take James into account:
If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.
Pure religion and undefiled before God and the Father is this, To visit the fatherless and widows in their affliction, and to keep himself unspotted from the world.
As well as Paul:
1 Corinthians 1:10
Now I beseech you, brethren, by the name of our Lord Jesus Christ, that ye all speak the same thing, and that there be no divisions among you; but that ye be perfectly joined together in the same mind and in the same judgment.
In reading these, I'm sure we can all agree that we are, in fact, not doing either of these at all. We have Catholics, Lutherans, Mormons, JWs, and many many more - all doing and saying and teaching different things. This becomes problematic for some people who are trying to learn the Truth (emphasis on that capital T), and many people incredibly devoted to what is (or appears to be, rather) wrong will quote such verses as 1 Corinthians 14:33 - however you will find someone do this, then immediately go and contradict Scripture itself.
There are many, many denominations out there - and I'm sure an equal or greater amount of theologies. And if my usage of the term theology appears off, that's because theology today does not do what it was supposed to. Instead of studying God, much of it (from personal observation) is finding out "what the book means to you". God did not inspire the Bible to appeal to each individual, but to His people.
So, is there a Biblical basis for the division it is causing?