I know there is a God. I didn't arrive at this conclusion by my intellect, for human intelligence is limited. Give up on trying to figure everything out, for common sense itself should tell you that you can't know or understand everything. This is not a matter of the head, but of the heart. Ask yourself this:
"If God is the truth, do I really want to know the truth?"
Our sinfulness makes us afraid of a holy and righteous God who we feel must demand an accounting of us His creatures. Atheists say they don't believe in God, but I don't believe in atheists. If they don't believe in God, then who are they so mad at? They claim wisdom and knowledge and call believers simple, but I see atheists as being extremely smallminded and limited.
Did atoms and microbes not exist until some human came along who was smart enough to detect them? How small these people's reality must be! How futile and pointless their existence! I commend you for at least being openminded enough to ask? How foolish it is to think that one's ignorance is evidence! Thanks for not being that way, wisdom is not beyond the grasp of one such as yourself. There is a God; He is beyond human comprehension; He is absolutely holy, righteous, and frightfully just.
His awesome majesty and power is terrifying and he is completely unapproachable by vile, prideful humans. Remember I said that it is our innate sense of this reality that drives some to deny His existense out of fear of the truth. They can't face themselves and their guilt, and they can't face a righteously angry, holy, and just God whom they rightly think will demand retribution of them.
What they don't understand is that this same God is also infinitely loving, kind, gracious and merciful, and that He paid the penalty for their sins and removed their guilt which was keeping them from Him. How? He gave us His only begotten Son Jesus Christ who took our sins and guilt upon his holy and innocent self and was put to death so that we may go free.
Believe this, make claim to it as a FREE GIFT from God, confess it to Him and to others, then walk in peace from now on with Him, always trusting Jesus' sacrifice as your justification in God's eyes, not your own merit. Then keep on learning more of Him and growing spiritually.