kidding???
in my book, it's ok for one family or kid to invite another to church, or church activities. But if they start sending stuff home everytime he goes over to play (without you requesting it) then a goat needs to die.
Growing up, one of my best friends was Mormon. His family was great. loved going to their house, but never did they push their religion on me. They would answer my questions if I asked, but never forced a thing.
I could never be Mormon anyway though. I need caffeine too much.