I mean unless you're doing a campaign where you worship Satan than there's nothing wrong with DnD, that whole thing with DnD being devil-worship was just parents in the 80s disliking "kids these days"
Preachers don't force you to be Christian. Preachers are there to spread the gospel and the Word and exhorting all who hear to come and receive the Lord Jesus. That's it.
As a Christian, you're not convincing anyone by telling them to "stfu". Isn't the point of Christianity that "everyone will know you're my disciples, if you love one another"?
The difference being that atheism doesn't require you to spread it to non believers. Similarly with Islam, one of the main points of Christianity is to spread the Gospel, for "how can they hear without someone preaching to them?"