The existence of evil and suffering does not mean that an all loving, all knowing, and all powerful God does not exist. Evil and suffering exists because of free will. Atheist would like to make this argument go away, but at the end of the day this position can't be refuted in any reasonable way.

Free will means that you have the ability to chose and act against what you originally chose to do. If God made it so that it wasn't possible for us to be evil, then we wouldn't have free will. We would be machines that couldn't choose to act against God's desires for us. This isn't love, this is slavery.