By the way, about Ajax being a jewish club:
Ajax has never been a jewish club. Of course jews, or any other population group, have always been welcome but there are no jewish roots at all. Ajax supporters call themselves 'joden' (jews) only because long ago rivaling fans started chanting and calling them 'joden' during the match . At first the F-side responded with chanting the Sesamy Street-tune, but as the joden-thing didn't stop the Ajax fans eventually adopted the name. This all started somewhere in the end of the seventies..... So since then 'wie niet spring die is een jood' (who doesn't jump is a jew) from the Feijenoord supporters became 'wie niet spring die is geen jood' (who doesn't jump is no jew) from the Ajax supporters.
That’s very similar to us. We’re not a Jewish club, we’re a North London club in an area historically associated with Jewish communities. Other teams used ‘yid’ to insult us, so we turned it into a positive as a show of solidarity.
A similar response from the fans, so maybe that’s behind the bond between the two clubs.