What groups are you specifically talking about here?
Does this include Catholics, Mormons, and mainline Protestants?
I'll wager Trump beats Romney in every category besides Mormon.
I literally know TWO people that are voting Trump... I am tied into Presbyterian (OPC/PCA), Baptist, AOG, some Methodist, Lutheran, SDA through Pro-Life contacts in a regional and sorta semi-national basis. Normally Republican RTL monies are all but dried up other than to specific down-ticket guys. My family is Presbyterian OPC, Victory, Covenant Presbyterian, and SBA, and extends down the Rockies, across the lower midwest into the South. Also around Chicago, and Ann Arbor Mich... And of course, personally, I am Christian Messianic and tied into that in a semi-national way...
In all of that, *NOBODY* likes the guy.
Christian specific forums don't like him either.
I think his 'evangelical' support is mainly with liberal urban churches. That's what it looks like from here.