My liberal Jewish friend agrees with you about this.
When she was younger, she went to synagogue a lot, observed every Jewish festival and liked eating cheeseburgers but felt she couldn’t due to the mixing of food. I always recall she told me her chest felt bruised after going to synagogue (you hit your chest every time you atone for a sin) on Yom Kippur. Later I had a liberal boss too, who told me that a day or so before YK that you have a day where you think deeply about what you’re atoning for.
My friend also told me when she sat shiva especially when her mother passed away she was touched by how many friends, relations and local Jewish people (she doesn’t attend the local synagogue that much in Delaware, where she lives) came to help and support her and her family, bringing food. Her DH is Catholic and their children are adopted from another country and are both girls and brought up in both faiths.
My nana has a Jewish surname and thinks or thought that the family were Jewish (tailors, French immigrants) and her father looked Jewish, had great business acumen and had the Jewish “nose” but she never found out for definite if they were Jewish but stopped practising the religion due to anti semitic behaviour.
One of my DM’s best friends is Jewish with a Jewish father and mother but told us recently that the surname had been anglicised to a British sounding one (not naming both as could be outing) her birth first name was Iska and changed to Christine, presumably so they’d fit in. Her father’s family all worked in the fur trade but got each other jobs. Things changed a bit when her father married a non Jew, her mother, and then her father sadly died. It’s sad that she recalls her Jewish first and surname being used as a young child but then being changed to fit in in England (Polish Jewish immigrants).