Yes, it's a bit of a mental shortcut that doesn't advance the argument much.
They mostly agree with their understanding of the Bible, so extend the benefit of the doubt to issues they don't yet understand.
Similar to supporting a policy because your favorite politician supports it.
Every time I've dug into some divisive issue I see core rational arguments on both sides along with these faith based cop outs or short sighted emotional appeals.
Some of these rules, IMHO, are absurd, but many you'd come to the same conclusion without faith as with it.