The problem of evil is one of the most urgent problems in different religions. The issue is complicated by the fact that most religions have mane trends and directions which make it hard to create one unique opinion about the problem of evil is one religion. Considering the Hinduism and Christianity as two different religions, it is possible to say that the attitude to evil is different there as well. Even though each of these religions has some particular similarities in understanding evil, the approach to the problem of evil is different.
Considering the problem of evil in Hinduism it should be stated that evil is believed to be the human choice based on the free will. To understand the concept of evil in Hinduism one should understand the meaning the concept of karma, which is believed to be one of the simplest and at the same time one of the most complicated concepts in Hinduism.
Karma for Hinduism is the universal law of cause and effect oh human thoughts and actions. Each human action cause an effect, thus if an action (a cause) is bad, the effect is also bad, while is the action (a cause) is good, the effect is good as well. According to the main idea of the religion, people have the quality for rebirth.
After the human death all karma is summed up and those people who managed to get a positive karma are given an opportunity to get a better rebirth, while in the opposite case the negative rebirth should be expected. Considering the evil events which are not impacted by human actions (such as earthquakes or tsunamis), Hinduism refers this to the play of the Gods who are responsible for the renewal of the life on the earth.
Thus, according to this idea, when too many catastrophes appear, the world is getting ready for renewal, that is why these events can be called evil only partially. I do not really agree with the position as I believe that it is chosen just to make sure that there is any explanation to the problem. The problem of evil in Hinduism is more complicated than the renewal of the earth and this problem has not been solved yet.
The problem of evil in Christianity is absolutely different. According to this concept, God has created everything on the earth and offered people the right of choice, one of the angels chose another way and was overthrown from the heavens. This is the Evil one who is the center of all evil, he is called Satan.
He is the character in the Christianity who directs people for performing devil actions. The main problem of evil in Christianity is why there is so much evil on the earth if God is omnibenevolent, omnipotent, and omniscient. This is the problem which cannot be solved.
I strongly believe that the existence of the evil on the earth makes it possible for people to understand what a good is. This is like the value of the things and people which they lose. If there were only good on the earth people would never know what the good is as to understand the notion it should be compared and contrasted to the evil. Only when people understand what evil is they are able to act in accordance with the good doctrine.