My father was born, raised, lived, and died an atheist. He saw no point to religion at all. For him, it seemed stupid. I should also mention the he was the the most moral and principled person whom I've ever personally known. I don't think he ever understood how two of his sons became religious Jews as adults. It bewildered him, but he didn't fight about it. And, of course, he graciously took part in weddings and bar/bat mitzvahs. Two interesting stories: 1) He served in the Pacific during WW2. He was a sergeant. The only other Jew in his platoon was a Lieutenant. When Yom Kippur was approaching, the Lieutenant asked him, as a personal favor, to attend services with him. My father declined. Shortly after the holiday, the Lieutenant was killed. My Dad always felt bad about that. 2) He spent the last 8 or so years of his life in a large retirement home, and the last few months in that home's nursing facility. When he died, we had a memorial for him at the home. The home's chaplain, an Episcopal minister, told me that few weeks before he died, my dad asked him to arrange a meeting with a rabbi. I have no idea what they talked about. Maybe he wanted to convince the rabbi that there's no God.