You can be a rational person and be entirely immoral and self serving. And idk what those people believe in, they’re extremely confused, the worst form of Trinitarianism is the one that denies God’s judgment and I guess that’s what they’re about? “Jesus forgave my sins so I can colonize, murder and rape with impunity”? They can say they “believe in God” in whatever way they want the same way a wife beater can rationalize it as love and passion, doesn’t mean it makes any sense.