Time is simply another dimension, just like space. The past is not necessary to reach "now" the same way that distance is not necessary to reach "here". More accurately, time is indefinite as opposed to infinite.
Regardless, I think this debate sprung up as a counter to the appropriateness of teaching evolution in schools without presenting alternatives. This is not evolution, however, this is a discussion on abiogenesis.
There is no definitive consensus in the scientific community regarding abiogenesis, so it is not something that should be taught as a scientific "fact".