I have found out that some Christians before the 7th century knew and borrowed concepts that are not found in the Tanakh but are found in the midrash, e.g., the story of Abraham and Nimrod, the story of the angels' reaction to the creation of Adam etc...
Besides, the Quran of Muhammad contains many of the stories that are found in the Hebrew bible, oral Torah, midrash etc...,that predate the Quran.
The question is:
How could gentiles get informed about some of the oral Torah (including some midrash) stories in those early centuries?
1- If those gentiles listened to those stories orally, then was it one of the Jews habits to share such mishnah stories with the gentiles before the the 7th century?
2- If those gentiles got those Torah/midrash stories through a written text, was it easy for gentiles (e.g., Christians) to get hold of a written midrash or mishnah?
Which medium (orally vs textual) may have informed them was the most probable, in their case?