I went to a Jewish kindergarten because my Catholic parents decided it was the best.

My brother went one better: he announced to all and sundry one day in Synagogue that Jesus has in fact already been.

All three brothers wore the kepa and knew the same words as everybody else.

Granted it was voluntary- but the effect on our psyche or life happiness? Apparently zero. FWIW my sister subsequently did a theology degree and regularly debates with rabbis from all over the world about the Old Testament in original form (Aramaic?)

I wouldn't worry about it. If you can't buy into it, cheerfully participate in quaint antique behaviors that remind us that no wo/man is an island and that every attempt to pretend away history has ended in disaster.