Christians will tell you that Yahweh is all-powerful, all-seeing and all-knowledgeable. In that case, why can't he do the following?
Wind up the entire system that allows the majority of people who are born to end up in hell? Every day thousands of people are born and most of them will end up suffering? Why allow this situation to continue for another single minute?
Reveal himself to everyone on earth in every generation, allowing nobody to doubt his existence, and allowing everyone to choose whether or not to have a relationship with him?
Save everyone, including those who don't believe in him? Why the requirement for people do believe in order to be saved? Is he incapable of saving everyone?
Destroy evil, Satan, hell, wipe the slate clean and start again?
Create an object that is too heavy for him to carry :-)
Even an all-knowing God could never be 100% sure that there wasn't some kind of higher authority, of which he himself was completely unaware ("super-God"). Logically, an all-knowing God is an impossibility.
Why didn't he do the following:
Foresee that the majority of his creations would reject him, and prevent the entire show in the first place?
Prevent Adam & Eve from having any children, thus discontinuing the line of people with original sin?
Foresee that wiping out 99% of the world's population in a gigantic flood as a plan to "rid the world of evil people" was never going to work?
Create beings who had free will but were unable to sin? If this is logically impossible, it therefore follows that there's no free will in heaven