Is God a logical contradiction?

[Rhizomorph13]

I think you can say that about humans too; you can't prove that you aren't the only mind that is conscious.

You also can't prove that the world isn't a simulation.

These are basic beliefs; reality is real and objective, and there are other minds in that reality.

I've heard it argued that God is a basic belief too but, much like the Kalam, the argument only gets as far as a creative thing, nothing remotely as fleshed out as the God posited by different religions.