Think of it this way: you need organization and purposeful design on your work desk to make it functional. I think everyone agrees on that. You can’t work when it’s a mess. No one can.
The difference between religious people and secular people, however, is that religious people think there is one RIGHT way to organize it- the way God wants. There is an optimal pre-existing design and we have to figure it out. We have to FIND it- through the right religion, the right sect/denomination of that religion, and the proper interpretation of that denomination. That closes off the mind to creativity, to new ideas, to compromise with others. The mindset becomes one of finding an existing design and somehow, through faith, being sure this is the ONE true design. You might see how that can lead to closed mindedness and stagnation.
The secularist, on the other hand, doesn’t think there is a pre-existing order to find. He doesn’t think the apparent order of the orbits of the planets or the Milky Way gives any insight into how he should be ordering his desk. He thinks it just comes down to how clever and imaginative he can be in MAKING it, designing it. He doesn’t think worrying about how God wants it done, even if he exists, is helpful. So that creates a mindset of creativity and openness to radical new ideas, experimentation, and an openness to seeing and negotiating with other points of view.
So it’s not that the secularist doesn’t believe in design. It’s just that he doesn’t think it’s helpful to think that design is going to come from anywhere except ourselves- us humans.
