The "Theory" of evolution is just that: A "theory." 
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There are two basic ways to try to explain how we got here: (1) "natural" explanations (2) God.
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Atheists like "natural" explanations even though they can't explain how a "big explosion" could produce "universal laws" and eventual "order" when everyone knows that, when anything from a hand grenade to a nuke explodes, the result is "disorder and chaos." 
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Atheists also like "natural" explanations even though, compared to a fully-loaded and functioning 2018 Ford Mustang, even a single-cell organism that can reproduce itself exhibits far more complexity. But, to the Atheist, the "simpler thing" (the Ford Mustang) was Intelligently Designed while the "far more complex thing" (a one-cell living organism) came about only by chance and accident. 
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Both Atheists and God-believers start with "something" "in the beginning." It's just that "God" makes more sense and is a better explanation than a "big bang" of lifeless junk.