All atheists, agnostic and almost all theists are same in sense of having wrong concepts about God. They argue about God all day yet never stop and think what they are actually talking about.
Proof of God's existence can only be creation and revelation but people dismiss both and yet demand proof of God's existence. If they were a thinking people they will have come to realise there is nothing else there whereby God could prove his existence if he has decided to remain undetectable by human senses for his own valid reasons.
These reasons can only become revealed to people if they will study the universe and the revelation of God. However almost all people are not bothered with making such effort sincerely and they waste their lives away in other useless things and die confused due to lacking in knowledge in this regard. For a detailed explanation of things about the quran and deen of islam see
HERE and
HERE