What is sheamus religion?

Answer 1

Sheamus is Catholic. This is represented by the crucifix he would normally wear around his neck (this particular crucifix is the cross commonly associated with Catholiscm). He also sang for the St Mary Pro Cathedral and attended Catholic schools in Ireland. Irish people are mostly Catholic.

Answer 2

No, there is no evidence of this. He is an Irish wrestler with a passionate devotion to Irish culture. In some cases, wrestlers are given a story-line that involves changing their name or their religion or going from bad guy to good guy (or vice versa), but these are story-lines and do not usually reflect reality. That said, there has not been any story-line about Sheamus studying Islam.