To put it simple. If you believe in the Evolution according to Charles Darwin, there is no other way. As a matter of fact, at some point the human race has a common ancestor with just about every thing living on this planet. The apes form an evolutionary branch very close to our own making them the species we are closest related with. Hence a common ancestor somewhere down the line is very plausible.
At least as plausible as the notion of Jesus (in my mind).
And hey, whats wrong with apes anyway ?
