I'm interested that you say you have decided to "believe in atheism" because that's what atheism is: a belief or faith. In other words, you can't prove scientifically that God doesn't exist; you can only accept it by faith.
Just because you don't find any evidence for the existence of God doesn't prove that He doesn't exist. After all, there may be a great deal of evidence for God's existence that you are simply ignoring, or have misjudged or misunderstood. You may even be driven to disbelieve in God because you want to run your own life, and you know you can't live any way you want to if God really exists.
This is why I challenge you to look at Jesus Christ. The Bible makes a startling claim about Jesus one that will change your life if you find it is true. The Bible says Jesus was God, who came down from heaven and took upon Himself human flesh (which is what we celebrate at Christmas). The Bible says, "No one has ever seen God, but God the One and Only, who is at the Father's side, has made him known" (John 1:18).
Do you want to know if God exists and not only that He exists, but that He cares about you and wants you to be with Him in heaven? Then look honestly at Jesus as He is presented in the pages of the New Testament. Your life will never be the same.