Show me your proof

[My imaginary friend is GOD]

I mean:

Why should I believe in something that cannot be proven?

Well I believe it can be proven.

Oh, well, if you believe it, it must be true.

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God is willing to prevent evil, and does on a daily basis. Why would He do so for those who despise and disbelieve in Him? He is able, as is expected from an omnipotent being. Evil comes to those who do not take the opportunity God has given them to be free of it. There will be a time and place in which evil will be no more, but just because we are impatient and limited in our ways doesn't mean that there is no God.

Then your God is as a petty child, and not worthy of worship.

Furthermore, this is demonstrably false. Evil in the world still exists and effects believers as much as anyone. See: pedophiles in the Catholic church raping alter boys.