Why are people eating grass for god?

Can't fault them. They've been raised like that with a false beliefs

It's their religion maybe

I imagine they're not going to get a lot of value in eating raw grass. If its not regular diet but rather for religious practice on certain periods only I guess there won't be any adverse effect. Our stomach can't handle cellulose that well and our teeth aren't built to handle raw grass.

Well... they are touching grass...