Does GOD really exist?

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Hi all, I wondering this question in my live. I do not know whether what I am wondering of is such a sin or not. Please kindly advise and inform me about this question or whether you have the same question? I do believe in GOD. 100% I believe in Him. I believe in Karma. I believe in heaven and hell. But sometimes, I questioning this one. Human is created by GOD. GOD also create other creatures and all the Universe. But, what being questioned me is, who created GOD. Or, is there something greater than GOD or greatest of all. But once again, who create even the greatest. As, for me, I really confuse if I question about this issue. How come GOD exist and create earthe and the UNIVERSE. Who created him? So, someone, please help me and advise whether these questions of mine is such a sin.