He's a "Christian" Zionist who interprets the Bible in such a way that he believes the Jewish secular state of Israel is the "Israel of God" (rather than those who are in Christ, born again and spirit filled = true Israel) and is going to build a 3rd temple where the Muslims today (and for the last 1300+ years) have their two mosques (guaranteed war). He also believes that all the Arabs are the "spawns of Satan". As a result of these unbiblical, skewed ideas, he will drive this country into Armageddon.
His heretical, destructive, end-times doctrine (eschatology) will drive us into a major war in the Middle East and perhaps with Russia and China as well. He expects Jesus Christ to return soon and he might try to hasten that second coming, by being extremely aggressive. Essentially, a "holy" warmonger. This is who "MAGA" is supporting to lead our DOD.