Religion makes blind

Any religion doesn't matter as long as it guides you on your way to perfection and does not lead you to commit sin.

You are right on this one. No religion understands God. Some do have pieces of the puzzle but then comes the problem. Everybody wants to rule the world. Man is thereby injected into religion. Discussion and as you say argument would go a long way to purge man out of religion but no one wants to change or have the drama. Point them in the right direction whether they listen or not. With enough people pointing, that is interaction. Maybe some light will get through.

Anyone who is a member, a committed believer in any religion must, by the nature of thing think that their religion is best. Some are wise enough to realize that there are flaws in the dogma of their religion but see a greater truth that allows them to see around the flaws. Religions have never embraced a universal truth that all religions shared. The function that any religion serves is to unite a group of people who share a common belief into a cohesive community. Religions will never face the truth because there is no universal truth, not because they are blind.

I believe that most of all the religions were not to be taken so literally at first. But over time the teachings that were to bring people to enlightenment became dogma, then the fighting began on which way was correct. The truth is they were all a system to reach another enlightened place, but they became stagnant and in need of repair. I say most because a lot of "Religions" today are just cults and offshoots of much older religions, these cults just need to disappear.