> God can't create a rock too heavy for God to lift because that's nonsense

Yes. Just like the omni concepts to begin with.

> These people don't obey the scripture because they believe the scriptures are not really authoritative in all cases.

If I tell you that I believe you don't really exist and yet I'm still talking to you, does that make me a fine rationalist? No. It makes me a total idiot.

People do stuff that makes no sense all the time. The fact that they do, does not suddenly make their actions exquisitely well intellectually justified or what not.

Actually, I think you are confusing 'rationalization' and 'rationalism' together.