If there is no God, it seems hard to argue for any ultimate meaning in the universe or any ultimate order. Certainly you can't argue for design. If there is no God, then there is no design. Everything is a matter of accident, so if someone believes that there is no God, but then talks about the world and the universe in design language, he is saying something contradictory. The language is kind of incoherent.
Beliefs have to have justification or grounding.
They have to fit in a world view in a coherent way to be defensible. You can't just pluck things out of the air and believe in them. Well, you can, but justifying them is an entirely different thing. I have a right to do anything I want. A right is a particular kind of thing.