How can you belong to a religion?

Human psychology denotes that every mind has the potential to perceive things differently, so how do we know we're worshiping the same God? An example of this would be the different factions of Christians going around, some who love all creatures great and small and others who are anti-gay etc.

I went to church expecting to see like-minded people and all I got were a bunch of simple, ugly, fat old women.

People have a problem with when other people dont agree with them, because it might seem like someone else could have better results or might find flaws in ones assumption.
and that is the reason why people enforce their own views upon others, because it might compromise their social position.