Had I perceived a discussion could happen this evening, I would have addressed the doctrine of imminency as taught by the early Church Fathers. The linked article might interest you ... or not.
The ECF's didn't teach a pre-trib rapture. They taught that the Church was the "New Israel" -- the heir of the promises and covenants given to OT Israel which attain their most complete fulfillment in the Church. They didn't teach that there will come a point where the Church is taken away from the earth while God once again deals exclusively with the Jewish nation and such others that remain. To the contrary, the ECF's speak of how the Church will be persecuted during the Tribulation!
The linked article might interest you ... or not.
Since the linked article doesn't discuss Patristic thought in the least, it's merely a distraction consistent with my opening premise that you will come up short on evidence that the ECF's taught of a pre-trib rapture.