"I can be a good person without God.”
Anyone of us can be good without God. All we need is a very low standard of goodness. There are 46 dictionary definitions of "good" from which to choose. The word "good" in God's Book, however, means moral perfection, in thought, word and in deed. That's the high standard of goodness that we be will judged by on Judgment Day (whether you believe in God or not).