Yeah I would. My church especially in the youth and college group is very come as you are. ALthough Im not sure I'd wear a letter T to Sunday morning service, only because I do normally wear jeans but a tshirt in general maybe a little to casual for me but hey personal opinion. HOwever on a Wednesday night or Sunday night it really doesnt matter at all, even the older members are in jeans and tshirts...its part of me why not show it off proudly. Plus there are other Greek alums at my church so Id have no problem sporting my letters.