There are several churches in my area that have a Bingo night....some have a casino night too. I've also seen church raffles.....etc. The Judea Christian Bible mentions the Israelites "casting lots." So, I don't know if gambling is a "sin" but I do know that there are quite a few churches that have no problem participating in the activity.
There are churches for real that truly if there's an occasion they conduct raffle ticket to their program, and I don't know if that is considered as gambling tools. But for me, gambling is really a sin.
Everyone determines what he considers to be sinful and what is not. Therefore it is difficult to say in general. For me personally, this is not a sin. I do not kill people, so the main laws of nature are not violated