I am an atheist but there is something about evolution theory i cannot explain, help?

Perhaps in our species the vocal organs didnt need to change so much as the brain did. I am not really sure myself but perhaps the brain was forced to evolve alot more than the vocal organs. Not to say they didnt though. We as humans had also used other forms of communication before our complex language system. eg ( our hands and other body movements, symbols and or carvings or cave paintings,etc.) But its just my guess. Good question though. Even if you got alittle rude. Relax not everyone is a friggin genius like you.