But there is also a deeper reason. The universe discovered by physicists and the sub-discipline of cosmology is grant, wonderful and astonishing but also very cold and lonely. It makes of humanity a trivial accident. We don't mean shit to anybody but ourselves. That we can make meaning in our own right, that we matter to each other, is the essence of humanism, but that isn't good enough for lots of people. They need the consolation of a caring universe. Alongside this is the fear of death and inability to accept it.
Then there's the third reason. Almost nobody actually understands the cosmologists' universe, how they figured it out and why they are so certain of their conclusions. I have a somewhat better idea than most because I've had a subscription to Scientific American since I was 13 but I actually have never taken a physics course, let alone studied cosmology. Basically it all started when Edwin Hubble discovered that the nebulae are actually entire galaxies in their own right, that the ones that aren't so close as to be bound to ours gravitationally are all receding, and that the farther away they are, the faster they are running away. No, that doesn't put us at the center. It would look the same no matter where you were, no matter what galaxy you were in, because the universe is expanding. So they imagined running the movie backwards and realized that at some point it must have been extremely compact. Maybe infinitely dense and infinitesimal. That would have been about 13.8 billion years ago. (Estimates have varied a bit over time but that's where we are now.)
There is plenty of evidence that this really happened, that for some reason -- of which we have not the slightest idea -- at that time it started expanding and eventually evolved into what we see now. I won't go into more detail but you can read books about it. Hawking's Brief History of Time still stands up pretty well but problems have arisen since then, some of the most difficult of his own making. Cosmologists thought they were getting everything figured out, then they discovered that the expansion of the universe is accelerating, for completely unknown reasons; that most of the mass in the universe consists of something that does not interact with matter in any way except by gravity; and when Hawking figured out that Black Holes evaporate, he created a whole new paradox which you can read about at the link but which you won't really understand very well.
Physicists have a complicated understanding of the universe, based on mathematical structures that predict the outcome of experiments or correspond to observations. I won't even discuss quantum theory but the black hole paradox is enough to get the idea across. It's true in a way that doesn't correspond to our everyday understanding of truth. It's about entities that nobody can see, distances that are incredibly small or incredibly large, time intervals equally infinitesimal and vast. For example, physicists believe that this is the smallest possible distance:
It's called the Planck length. It's about 1/100,000,000,000,000,000,000 the diameter of a proton. If you've been reading the Bible with me you know it's ridiculous, but unfortunately I think the average person, if presented with basic ideas of physics and cosmology, would find them more ridiculous than Noah's Ark. It takes a lot of effort to understand all, or really any of this. Faith is just easier.