Bad reason Number 1 for becoming an atheist

Bad Reason #1. 

 If God existed, there would be no evil and suffering in the world as a good God and the presence of evil cannot co-exist. 

 Many a times, we hear of people making the statement that they are atheists because of the evil in the world. According to them, the concepts of suffering and evil cannot co-exist with an infinitely Good and Holy God and thus they come to the conclusion that God doesn't exits. But is this really a logical conclusion to make?

One assumption that these people make is that we humans can comprehend the thinking of an infinitely intelligent being capable of creating space and time itself. According to Christianity for example, God created the universe and all the laws of physics effortlessly and in a mere instant. Surely, there's no way a human can understand His way of thinking. Would we be able to understand a species that has taken 10 billion years to evolve? Most likely not. Would an ant have the mental capacity to understand the thinking of a human? Of course not.

Another misconception is that they seem to think that we know and understand what it means for an action to be "good". This really isn't the case. It's not as simple as simply stating that prevention of suffering and creating happiness is the definition of a good action. Philosophers have spent centuries trying to understand what a "good" action is. Ethical altruism, ethical egoism, and utilitarianism just to pick a few examples have different definitions of what "good" is and the debate is all but over. So we can't really say that a good and perfect God cannot allow pain and suffering because we don't even have a definition of what "good" is.

There's a lot that can be said, but we live in a world where pain and suffering are prerequisites for success and happiness. E.g. Studying hard to pass an exam. There are other more historical examples. I did the Coursera course called "A Brief History of Humankind" which was pretty fun and one of the interesting things learnt was the effect of colonization on the world. In summary, colonization resulted in short term problems for the people but in the long term, it did more good than harm. My point is that we have historical evidence to show that sometimes bad can cause more good in the longer run.

All in all, the logic that there can't be a God because of the presence of suffering and evil isn't really a valid and sound argument.