Scientists say the universe began with a big bang, and it is reasonable for us to believe that something caused the bang. That something, we believe, was God. Creation shows signs of order, of laws of physics. If various properties of matter were different, then earth would not exist, or humans could not exist. If the size or orbit of earth were different, then conditions on this planet would not permit human life.
Life is based on incredibly complex chemicals and reactions.
Some have faith that scientists will eventually demonstrate a non-god origin for life. But for many people, the existence of life is evidence of a Creator God. Humans are self-conscious creatures who explore the universe, who ponder the meaning of life, who seek significance. Many people claim to have found meaning in relationship with God. If there is no God, then humans have no basis for proclaiming anything evil, no reason to condemn racism, genocide, torture or any atrocity.