To the best of my knowledge, they’ve had speakers like Ben Stein (Jewish) and Newt Gingrich (Catholic) in the past. It appears they invite conservatives, regardless of their religious affiliation.
Christians believe we share the same God as the Jews -- the God of Abraham, Isaac and Jacob. Mormons -- going back to Lds "prophet" Hinckley and statements in their official Ensign magazine, claim Mormons worship a different God than Christians do. (Something I actually agree with)
I don’t think any of them were a commencement speaker.