People who deny the existence of God can be classified into three categories. Firstly, those who believe the universe created itself; secondly, those who believe the universe was created by nature and finally, those who believe the universe happened by chance or coincidence.
For those who claim the universe created itself, are claiming a logical contradiction. For example, if someone claims Mr. X created himself, that would mean that Mr. X had to exist before being created to be a creator and existed again at another time to be a creation! That would mean he existed twice and this is impossible. Another example to clarify this point is if someone was in a room and knows there is a book on the table. When this person leaves the room and knows that no one will enter it and when he returns he finds the book on the chair. Would he accept the book moved by itself? The answer is simply "No", because we all know that books cannot move by themselves. In the same way creating is not an attribute of the universe itself.
For those who claim the universe was created by nature, it is obvious that nature is a part of the universe. Since nature is a part of the universe, it is as if they are claiming a part of the universe created the entire universe! These people are referred back to those who claim the universe created itself and we have already proven this cannot be the case. Another example to clarify this point is when one sees a table; can that table make another table? The answer is simply "No". That is what this so-called BIG BANG theory is like; when they claim that the entire universe was formed by a single particle. Whoever believes in this BIG BANG theory is easily cornered by this question: "Who created this so-called single particle to begin with?" As you can see this BIG BANG theory, which Darwin has suggested and some scientists agreed on has been proven wrong.
As for those who maintain the idea that the universe existed by chance. There once was a teacher who was teaching his students that the universe happened by chance without a Creator. One of his students knew that this was not true, so when lunchtime began the teacher and his students went to lunch except the student who knew what the teacher had said was not true. He stayed back and wrote on the blackboard in big writing: "OUR TEACHER IS A DONKEY", before going to lunch. When the teacher and his students came back from lunch, the teacher saw the writing on the blackboard and asked his students: "Which one of you wrote this?" None of the students replied. Pointing at the blackboard he yelled: "Who wrote this about me?" Still none of the students answered. Then the teacher got very angry and told them that they would all have to stay back after class until an answer was given. The student that wrote it stood up and asked: "What makes you think that one of us wrote it?" The teacher replied: "It is impossible that the writing on the blackboard just happened by chance, someone had to write it!" The student replied to the teacher telling him: "You are teaching us the universe happened by chance without a Creator, but you cannot accept that the writing on the blackboard appeared without a writer!" The teacher was shocked and had nothing to say. It is enough proof for anyone to see the perfect order and precision the universe is in, which becomes obvious that such order cannot happen by chance or coincidence.