Scott Brown would be a terrible pick.
You guys have to remember that Scott Brown is pro-choice. Religious conservatives already hate Trump. A lot of religious conservatives hate the fact that Trump used to be pro-choice and the fact that he isn't religious at all and says very offensive things. He does best with voters that aren't religious. A lot of religious Republicans are already considering not voting if Trump wins the nomination, and choosing a VP nominee that is pro-choice would make this problem worse. A ton of conservatives would stay home if Brown was chosen as the VP nominee just because of abortion. Brown would be a terrible pick, and would guarantee a Hillary presidency.
How can Trump not be religious? He knows the book of Two Corinthians.
He also keeps a book of Hitler speeches by his bedside, and I'm told a lot of Neo-Nazis think of old Adolf as a kind of god.