In any case, humans are aware of evil pretty universally, meaning that they are aware of God, whether or not they like it. This means two things. Namely, that God clearly exists, but also why he allows evil or why he created a universe where evil (which comes about via the free will of angels and humans) could exist in the first place, is a great mystery. Clearly free will can't be the whole answer, since God could have created humans or angels in such a way that they would always use their free will correctly (as it is in heaven!).
Nevertheless, God has redeemed us from all evil in the cross of Jesus. And if he created a world in which evil was possible and then suffered its worst effects for our sake, then we can't very well complain about it. Even if he didn't redeem us, we would still be his creatures and that would be that.