July 15, 2016
For the most part, the voting intentions of people in major religious groups closely resemble those seen in polling conducted at a similar point in the 2012 campaign. Roughly eight-in-ten white evangelical Protestant voters (78%) say they would support Trump if the election were held today, just as 73% indicated they would vote for Romney in June 2012. And Trump enjoys about the same level of support among white mainline Protestant voters as Romney did four years ago.
Source: Religion and the 2016 U.S. presidential campaign | Pew Research Center