When in Rome, do as the Romans do. When at a Reform Jewish wedding, you should show respect and wear a yarmulke if that is what is expected. This is neither an affront to Catholicism, nor is it an affront to Judaism.
We are all brothers. When Peter and Paul mingled with the Gentiles, they didn’t refrain from eating their food or showing respect for other cultures while still maintaining their Christian moral code of conduct and righteousness.
Our Savior was a Jew. His earliest followers were Jews. Mary and Joseph were Jews. All adhered to the Torah as sacred and holy. There is nothing wrong or immoral about being a Jew.
But do not fall into the trap of believing this law came from Old Testament! First, it came from the Talmud(yes, the very same Talmud which stated Jesus was conceived while Mary was menstruating). Second, the custom was put into place so that Jews could be identified as different or set apart from those of the Greco-Roman pagans and Christians! Please don’t wear the yarmulke!
Good grief. The Torah - which is the “Law” - was given by the Creator as a gift to the Jewish people. The Law contains all that is holy and good, including the Ten Commandments, and numerous moral admonitions which we as Christians take to heart even today.
The Talmud is simply rabbinic commentary and debate on the Torah, and is an entirely different subject altogether. It has nothing whatsoever to do with showing respect towards our Jewish brethren at a wedding by simply honoring their religious traditions.
A yarmulke is worn as a sign and reminder that the Creator is above us all and watching over us, and that we should show respect to the Creator. The world would be a better place if everyone adopted such a philosophy.