Responding to a statement like "I'm an atheist because all religions are stupid" requires a thoughtful and respectful approach. It's important to be understanding of the person's perspective while also expressing your own views, if appropriate. Here's a suitable response:
"I respect your right to have your own beliefs and opinions. People have different reasons for their beliefs, and it's essential to find what resonates with you personally. While I may not share the same view, I believe that discussing and understanding different perspectives can be valuable in promoting tolerance and empathy."
By acknowledging their viewpoint respectfully and expressing your openness to different beliefs, you demonstrate a mature and open-minded attitude. Engaging in a constructive conversation about differing beliefs can lead to mutual understanding and respect, even if you don't agree on everything.
If the person is open to discussing further, you can explore their reasons for considering all religions as "stupid" and share your own thoughts on the importance of diversity in beliefs and worldviews. Remember to keep the conversation civil and avoid turning it into a debate or argument. The goal is to foster understanding and tolerance for each other's perspectives.