As I stated before, Trump's salvation is between him and God. I can only look at his statements. And believe it or not, I do pray for him.
Donald Trump on God and Forgiveness
Donald Trump compares Ben Carson's 'pathological temper' to 'child molesting'
Trump ridicules Carson's Christian conversion: Give me a break
Trump: Not Sorry for Attack on Carson's Adventist Faith
Trump: Just Remember That Not Too Many Evangelicals Come Out of Cuba
To mainline Protestants, such sects as Seventh Day Adventists are "weird".
Trump doesn't have a filter, so he often says things that others think, but professional pols don't say.
OTOH...read posts from when Romney was first running for president, but quit, and see what posters had to say about Mormonism; for example!