I don't know how long Trump has been connected with the Episcopal Church, and his famous comment about "the little cracker" suggests he is poorly catechized or not terribly interested in theology and tradition. So I don't think he's an evangelical; he's not interested in a personal relationship with God, he just goes through the motions and tells the Big Guy they'll meet for drinks and snacks same time next week.
The interesting thing about TEC is, although its numbers are collapsing, it's the church of convenience for DC pols. It still has some cachet among the elite, and there's a couple high-profile churches in the District. There's the "President's Church" a block or two from the White House, the one Antifa tried to burn down. And there's the National Cathedral, to which God sent an earthquake because of their apostasy. These are good places to be seen. Obviously there was some controversy that last time Trump was seen outside the President's Church, but I'm sure he meant well. When is the last time a President took such a personal stance in defense of Christianity?