Many may claim they are becoming less Jewish by disobeying the Torah laws. I will then tell them there is nothing to disobey, as God doesn’t want you to worry about it. Right, “he” doesn’t want people to feel subservient to “him.”
Moreover, you were always Jewish, even if you practiced Buddhism, or followed Jesus. It is the same for the Persian man, who may have joined the monastery much to the chagrin of his parents. He is eternally Persian, nonetheless, and he doesn’t belong at that depressing place too.
However, you cannot become Jewish, as there is no religion to convert to. It is like trying to become French, or Guarani, and even if I resided with them for 18 years, they would still tell me to at least come and visit them again someday, I hope.