http://christianchat.com/bible-discussion-forum/121215-why-there-so-many-different-sects.html
This thread (mentioned above) actually made me sad, but it was an honest question. Not because of the thread itself, but because different denominations (thousands) are basically all because of division caused by people being oblivious to the truth of God's word in many different areas of scripture. I have determined that this division is caused by purposeful rejection on the part of a sect, or an individual having no desire to connect one truth with another truth.
Then of course there is division caused by falsehood being noticed, and a group or individual divorces those falsehoods because they are proven incorrect according to scripture. Nevertheless, there are still undetected errors that follow them, previously learned from what they departed from so errors according to the truth continue.
It appears that there are pet doctrines that human nature subconsciously adheres to because they seem right and cause a certain comfort despite sincerely believing a doctrine that could be compared with a spinning wheel stuck in the mud, expending all kinds of energy without going any further because the goal has already been met according to the doctrine they believe in.
Being oblivious to the truth in certain degrees causes division. Division causes multitudes of diverse doctrines, and all doctrines must have a formula and format that says
“we believe all that is necessary, and nothing else is important enough to investigate because it doesn't apply to our current status.”
That mindset causes obliviousness to one degree or the other due to satisfaction with the precedence of contentment issued from behind the pulpit. (Acts 17:11-12) Being satisfied according to human standards causes division if we look into scripture that defines the fleshly mind. Some is subconscious, and some is on purpose defending our doctrines rather than contending for our God given faith, thus prohibiting growth in the grace of God Almighty through Christ Jesus our Lord and Savior.
Who can actually say that their church teaches and preaches all the truth we will ever need without earnestly studying the Word of God for ourselves?
[video=youtube;RCyYuLQ7_Ws]https://www.youtube.com/watch?v=RCyYuLQ7_Ws[/video]