Here are some questions that often visit a thinking head :
If God is, why does He hide ? Why doesn't He appear before us and reveal the truth ?
If God is good and merciful, and also omnipotent, why is there so much suffering and injustice in the world, especially for people who are good and upright ? Why did the prophets suffer ?
If He is good and kind, but cannot stop this mess, is there another Supreme Being such as Satan / Devil that is more powerful than God, and if yes, who made Satan ?