There's a lot of dislike for James River Assembly in the community in general and on this sub in particular. In my book, it is well-deserved, for reasons enumerated in other comments.

That said, you probably can't convince your parents to go to another church easily (if at all). If you're more comfortable with your grandparents' church and they live nearby, you can see if they'll take you with them to services.

Other than that, I understand that The Venues and National Avenue Methodist are both very welcoming and certainly smaller than JRA.