Two questions for Christians
Can God make a rock so big that he can't lift it?
Could god have changed his plan for our existence before setting it into motion without affecting our free will?
Answering no to either shows us that god is not all powerful. Answering yes to the first one shows us that he's not all powerful. Answering yes to the second one shows us that God must want certain people to exist to convince others of his nonexistence.