Writer and Artist: James Sturm
The team name and the beards take their inspiration from the real-life House of David teams, though to classify that cultist operation as "Jewish" would be quite a stretch. While I can find no historical equivalent to the team in the book, Jewish players banding together not to proselytize but simply to make a living because other teams wouldn't hire them, it's not difficult to imagine that one or two existed. There were other barnstorming outfits bound by ethnicity: Native Americans, Italians, Irish and, of course, numerous African American teams.
The book was recommended to us by our comic shop clerk who studied under Sturm at the Center for Cartoon Studies in White River Junction, Vermont. It is the first of two baseball books for Sturm, who also wrote and drew Satchel Paige: Striking Out Jim Crow. I'll definitely seek that one out, too.