There is a reason for the diverse number of religions and denominations today. In Paul's Second letter to Timothy he aptly summed it up in these words : " The time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; and they will turn their ears away from the truth, and be turned aside to fables." (2 Tim. 4:3,4NKJV) Basically, its caused by a failure to listen to God's Word and putting personal opinions first. By not heeding the warnings contained in Scripture, such ones fall prey to all sorts of misleading teachings, and sadly come to believe the lie.... thus the proliferation of religions today!