There is so much wrong here. (I'm starting to sense a common thread in these 'proofs'.)
First, even if evolution were disproved, it would not prove there was a god. God and evolution are technically independent. There are plenty of people who believe in both.
Second, let's clarify what evolution deals with: it deals with how life changes. It has nothing whatsoever to do with how life began. Once begun, it evolves. But origins are not a part of the theory of evolution, and science has no definitive explainations for abiogenesis just yet. Some good ideas, but no clear picture. So, our theist is correct: it doesn't explain what (not who) made life start, but neither does it describe the way life started.
And as I've pointed out previously, there doesn't really need to be a why. Lots of things happen for no reason.