God made humans in his image, with the desire for us to attain maturity and self-direction. Evil allows us to reflect on our behaviour and become better people.
Irenaeus argues that if God intervened constantly to prevent evil, it would prevent regularity in the universe and make conventional science impossible
The Abrahamic religions do not deny that evil exists, but ask believers to accept that God is with them in their suffering and they will be rewarded in the end