Funny, I thought the question of predestination vs free will was a *philosophical* -- as in, each puny religion is just one (stupidly superstitious backwater) sub-sector of the wider catregory -- concept.
I would think that the more general concept in Philosophy is defined in terms of Behaviorism - i.e. whether we simply react to stimili or whether we can truly transcend our impulses.

Anyhow, I'm not sure that the question of predistination versus free will really has much meaning outside a theological context (and really not much meaning there except to tie up some loose ends about the "chosen" ones).