Evolutionists are either atheists or believers. Believers propose an evolution under the direction and control of a God, extrinsic to evolution. Besides, creation is not a single act, but an ongoing continuing act by which God sustains what He created and allows the process of growth and development to continue. I do not believe that all the existing animals and humans evolved from one single form of the simplest cell life in a linear ascent, nor have evolutionists proved it beyond a doubt. But evolution at different stages is a credible hypothesis.
Human person is a rational animal.
On the other hand, atheistic evolutionists try to explain the whole universe, including humans, by materialistic evolution without God. We don't care whether it was with a big bang or whether 15 or 100 billion years ago. If evolution had a beginning then matter also had a beginning. Nothing can come out of nothing, therefore the origin of the elements of the universe demand the existence of an eternal being extrinsic to the universe. Nothing can move without a mover.