Many theologians accept the criticism that their beliefs lack rational proof, and still insist that they are right to believe in the existence of God. However, it is much harder for them to be confronted with the problem of evil, because this makes their beliefs irrational and contradictory, instead of simply unreasonable.
Evil is logically inconsistent with the existence of an omnipotent and omni benevolent God. If we define Ëœevil' and Ëœgood' as opposites, and determine that good will always try to destroy evil, we can conclude that an all-powerful and good being would get rid of all evil; since this is not the case, an omnipotent good being cannot exist.
An adequate solution to the problem of evil is a change in the fundamental definition of either Ëœgood', Ëœevil', or ËœGod'. Some people choose not to believe in the omnipotence of God; others argue that evil does not really exist. This does not actually solve anything, as the rejection of a premise often turns out to be false, and the theologian who does so actually restates said premise later in the argument.