this misunderstanding is repeated a lot for the non Abrahamic religions followers, but it's simple, Allah is the most merciful, forgiving, and alos he's the wisest
non abrahamic religion follower deny that the god not forgiving sins, and they believe that the god is forgiving all sins,
but indeed when i asked them some questions we couldn't reach a logical answers like:-
1- if the god is forgiving all sins to everybody, why he punished us by earthquackes for example, why did the god send the earthquake to destroy japan?, why there are many poors allover the world, people die because lack of food, why something become expensive for most of the world? why not all of people have the same level of living level, many other questions which non- abrahamic religion followers couldn't answer
2- if there is no hell, i can't call the god by absolute just, because who reward GHADAFI, Hitler by the heaven and punished isn't fair, so where is the victims right? so we will be more just than god
and surly we are not
I can only provide the Hindu response to these questions.
I reject the idea that God interferes by causing Earthquakes and tsunamis and famine etc. The laws of nature run the universe, these were set up by God, he does not need to interfere any more. Karma is the law of cause and effect. Everything that happens is the result of actions that occur previously. Everything that happens in nature has an important purpose, allowing for renewal of life.
Our pleasures and suffering are determined by our own past actions, and by each other. They are not sanctioned by God.
The purpose of life, according to Hinduism, is to become enlightened. While we exist in illusion and ignorance, we continuously create action that results in negative consequences to ourselves and others. All of our experiences, life after life, cause us to grow and come closer to understanding God and Self. When we reach the highest understanding, we are no longer subject to illusions (which includes suffering).
People like Hitler are subject to this karma, this law of nature. His own actions and state of consciousness will bring him suffering. But not in hell, in his future life.
Eventually, that individual soul that was once known as Hitler, will be a great personality. But that can only happen if he is given the chance to grow and improve through real life experience that gives him wisdom. Eternal punishment is simply abandoning the individual who, in one lifetime, was not wise enough to understand right from wrong.
In Hinduism, God gives us unlimited chances to become better. In his mercy, he comes to the planet himself, and provides great Masters to help those who want something more than this life of temporary suffering and pleasure. He does not punish or reward us. Our destiny is our own making, and we can remain here in this world forever if we choose, birth after birth.
I think that my idea of God is that he/she is more like a parent than an overlord. A parent has unconditional love for his/her children and will always do what is best for them. So God has established laws that teach us lessons- when we touch the fire, we get hurt. We will continue to get hurt until we learn that we should not touch the fire. But if we're really stupid, and touch the fire again, our parent does not discard us as hopeless. The parent continues to help until we finally learn.
This is Karma, and this is how I perceive God.
, i just may need to add more 
