On the whole "man" is a little scared of his place in the universe. Each person is just a speck of sand in the whole scheme of things, and he wonders why he is born and then dies.
Man is a bit frightened of this so to make it all seem worthwhile he "invents" this super being who is looking after us and this makes us feel a little bit better. Nobody has seen him, or met him, or knows what he looks like, or how he wants us to behave.
So some say this "being" says we should not eat meat on Friday, or work on a Saturday, or we must wear a scarf round our head, and so on, and of course these people all fight for the right to be able to do that.
And of course organizations are set up to "look after" peoples religious beliefs, but all they do is con money out of you (look how rich the catholic church is, or these American so called religious leaders, and look how rich the old monastories were).
This religion thing is one big con and it preys on our weakness.