as for the class part, not sure how you stop someone I affiliated with the university from making these shirts. I wouldn't wear one, but understand that not all ND fans are like me.
as for the university not teaching the beliefs of the church, people are both rot and wrong. Some professors and priests are very religious, while others are not. The university itself has made some bad choices over the years and the only thing fellow alums and I can do is write letters, protest these decisions and withhold donations.
All that said...Go Irish, beat Bama
Heresy! HA!
Fighting Irish...go I-R-I-S-H.
Win one for the fighting Leprechaun.