Why God doesn't stop satan?

[R00tKiT]

I don’t think you considered the question closely enough. If god knows me, then he knows what would convince me that he exists, and if he’s all-powerful, he should be able to create a world where he is capable of convincing me that he exists. If he can do that for me, he can do that everyone. Why didn’t he?

The world you're describing already exists. Because there are believers who are absolutely convinced that god exists, this world already satisfies your requirements. But not being convinced isn't problem per se, no religion -not Islam, in any case- says that people who genuinely seek for the truth and can't find it/not convinced of what they find will be punished by hellfire. What would be considered punishable is to decline accepting the truth despite being convinced of it. If someone absolutely knows the danger of smoking, but proceeds to chain-smoke anyway then die because of it, they only have themselves to blame, not God's foreknoweldge......

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I would also add that no one can have a coherent view of the world if they don't accept God's existence. Some theologians argue that God's existence has the same status as belief in other minds or in an external world. But I admit it's a subject of debate.