Opposing "Peak Oil" has nothing to do with accepting abiogenic oil.
All of the shale oil obtained by fracking is "fossil fuel" and it was all discovered by people that believe oil comes from fossil marine and lacustrine plankton.
Because of subduction processes, it's absolutely NOT true that there are no fossils 5 miles down; fossil-bearing layers go far deeper than that.
There will be a day of peak oil. It won’t mean there isn’t any oil left at that point. And I don’t believe we are near it at this time.
We will start producing less oil as we get other more economical choices. The stone age didn’t end because we ran out of stones.