The existence of evil in the world is another thing to argue about when talking about the existence of God. Religious people believe that God does exist and that God is omnipotent, omnibenevolent and omniscient. Then why is there evil and suffering in the world? If God is benevolent (good), he must want to get rid of suffering. If God is omniscient (all-knowing), God must have known about all the bad happenings in the world e.g. The Holocaust. If God is omnipotent (all-powerful), God must have been able to prevent or get rid of suffering yet evil still does exist in the world and some of the evils are not stopped. Therefore a being that is completely good, knows everything, and is all powerful does not exist. And so, there is no God. Religious people believe that God gave man free will, so God is unable to intervene with the actions that humans take however powerful, good or knowing God is. Therefore this does not mean that God does not exist.
In addition is the science of the creation of the world. Science explains the universe starting with the Big Bang but others believe that God started the world. Scientists have proof of the beginning, what happened from the Big Bang and onwards. Although they are unable to explain how the Big Bang actually started, what caused the Big Bang? Some religious people believe that God started the Big Bang and everything else afterwards is the cause of God. On the other hand others believers for example Christians believe that God created the world in seven days taking a rest on the seventh day.
The belief in God could just be in the human mind but not actually the reason for Gods existence. God knows that humans would be happier if they were aware of the existence of a loving God. So if such a God existed, he would make sure that everyone knew it. There are a lot of people who aren't aware of the existence of a loving God. Therefore such a God does not exist.
There are many different religions in the world, with different Gods and Goddesses so there has to be one which is correct about God as not all of them could be right. Thus there not actually existing a God or Goddess. However religious people believe that there is a God and that all religions have a truth and that all the religions are just different pathways towards the same God.
In conclusion there are many different arguments for and against the existence of God. We, as individuals, have to make up our own minds using the knowledge that we have from the environment and personal experiences on whether God does exist or does not exist. However we should remember to look at both sides of the argument for and against the existence of God. In the end, we are not going to be able to decide on an answer as an entire human race, but it is a decision we are able to make for ourselves.