Sherman, in that respect, Christians who deny evolution at least have the courage of their convictions (as irrational as those convictions may be) whereas Keyplus accepts evolution only because he cannot dispute it. As has been demonstrated on the science thread below, Islam makes every attempt to fit the book to the facts. If you ask where the Koran mentions evolution, the chances are you'll be given the verse that says Allah made all living creatures from water, but the verses that say man was made from clay, from dust, and from mud will be kept well and truly under wraps.
As for how they make that leap, it's usually because they haven't learnt or been taught about other religions, and consequently they haven't made an informed choice. They just go along with whatever their particular culture tells them. As Sam Harris says all people of religion are atheists where other religions are concerned.