Argument for atheism from impossible actions

[Captain Scarlet]

The Christian god is said to exist..

Are you a dualist?
These are my premises:
1. God is immaterial, not materialistic
2. God has created everything and can do whatever He pleases
3. Since God can do whatever He wants, He can enter and manipulate the materialistic world
4. Therefore, God is not constricted to the immaterialistic world
Does that make sense?
Atheism wouldnt be true, a Deistic God would be true, if your premises were correct...

Not a dualist. I said "god is said..." I'm not expressing it is my view but using the theist conception of god to demonstrate god cannot exist. As we are both aware there are many other arguments on both sides. If my premises are true a deistic or theistic god are ruled out, unless it is claimed that the deist god is material.
Your rejoinder does not form a refutation. I'm arguing that if god is immaterial and energy is only of the material world then god is not omnipotent Because he has no way of acting in the material world and therefore does not exist.

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No, it just means the Christian God isn't omnipotent.

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They just messed up the definition of a God they can't possibly know about.

Correct it does just mean that god isn't omnipotent. But By definition if not omnipotent he is not perefect and therefore does not exist. This is because the ontogical arguments used for theism can conceive of a more perfect god and therefore we are in an infinite regress. Not our problem but a problem of theisms own making.