It was a coup for Democrats: An emerging young evangelical voice, a registered Republican no less, accepted their invitation to deliver a prayer at next week's Democratic National Convention.

But Cameron Strang, the 32-year-old editor of edgy and hip Relevant Magazine, had second thoughts and pulled out of delivering the benediction on the convention's first night, Monday. Citing fears that his bridge-building gesture would be wrongly construed as an endorsement, Strang said he instead hopes to take a lower-profile role, participating in a convention caucus meeting on religion later in the week...