religious people, if a god appeared on earth, and said everyone's belief systems or religions are wrong, would you accept it or convert?

No. I've watched Stargate too many times for that.

If God gave me direct revelation to improve my understanding; yes, I would accept it.

Atheist people, if God is more rational than physicalism would you even consider accepting God?

We cannot know what we would do although intelligently, speaking that isn't likely.

Gods do not appear.

no one accepts God and I mean no one so they will not accept it

There's a reason that religious people struggle with these types of hypothetical questions.

Asking them to imagine their god is imaginary, gets them far too close for comfort to an unpleasant truth.

If it's not my god it's a false god and no matter how many gods show up, mine is the only one and I will cling to this thread til I'm dead. Oh wait, I'm a heathen. If it's a real god, I'll listen but I won't assume he needs me for anything if he doesn't specifically ask for it.

God is with me everyday and he communicates with me everyday

he has no need to "appear"

If it was questionable enough that I had to hesitate and make up my mind, then no, I wouldn't accept it. It's not God. If God appears on earth, nobody will question who he is.

If it actually is God, sure. There's no logical reason to disagree with an omniscient being.

The difficult in such an instance would be determining if this is actually God or if it's something else.