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Why does God allow evil and suffering?
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The answer is actually quite simple: being all-powerful doesn’t mean being capable of doing impossible things. If your definition of omnipotence includes the ability to do the impossible, then, as a Christian, I have no problem saying that God is not omnipotent
Well, yeah, if you simply believe different things, then criticisms of the beliefs you don't hold aren't a problem.
Now, I'd wager that out of the ~2.25 billion Christians, about 2 billion of them would be at best skeptical that you qualify as a Christian at all and essentially all of them would vehemently disagree with you, but they disagree with each other about nearly everything too, so you aren't exactly objectively wrong to call yourself a Christian.
However, that doesn't make others wrong to level these criticisms at the vast majority of Christians who do believe that "through God, all things are possible" literally means all things, even things that are otherwise contradictory.