As I wanted to get a response specifically from Buddhist-following Jews, I thought I should put this here. If I am mistaken please correct me.
My question is, are there any Buddhist-following Jews, that have read the books "Letters to a Buddhist Jew" By David Gottleib and "Jewish Meditation" by Aryeh Kaplan? What were your thoughts on them?
Also, why do you think that so many Jews specifically seem to find Buddhism more fulfilling than their own religion, when it seems as though many of the principles of Buddhism have their parallel in Judaism? If I like ice cream, why would I go to the Baskin Robbins in the next neighborhood when I have one right next door?
I'm not a big fan of labels but you may feel free to most definitely refer to me as a "Jewish Buddhist." I have not read Letters to a Buddhist Jew, although I would like to someday.. I also want to read the famous book: "The Jew and the Lotus." I have read Aryeh Kaplan's "Practical Jewish Meditation" (I think it was called?) and I absolutely loved it.
As for your main question, I think LuisDantas offers some great points. For many Jews, Judaism is an inheritance.. and sometimes, when one feels lacking in their spirituality, it is nice to get an outside perspective.
I do not want you to get the idea that because Judbus are looking outside of their religion for spirituality, that this means they have not deeply looked within their own religion for spirituality. Trust me when I say I have looked very deeply within my own religion. My situation is pretty complicated, but I will try to summarize it as best as I can. I was raised Reform Jewish, had my Bar Mitzvah, conformation, etc.. but it wasn't until freshman year in college that I really developed an insatiable passion for spirituality and finding God. Believe me when I say that I most definitely have looked deep and hard within my own religion to fill this hole in my life. I've read dozens of books on Judaism - about philosophy of mitzvot, talmud, the entire Tanakh, commentaries, Kabbalah, Jewish mysticism, Jewish meditation.. the list goes on.. but the spiritual hole just never seemed filled for me. I started to really explore Jewish mysticism and Kabbalah, hoping it would help fill this hole. I must say I find Kabbalah very interesting, but ultiamtely it is simply too esoteric for me, way to shrouded and wrapped in layers upon layers of "myth" that it feels like walking through a labyrinth to try and decode the truth of the matter. This is okay I guess, but for myself, I prefer the mystical teachings of Buddhism or Hinduism that are less shrouded in myth and are more up front in directly putting the truth - plain and simple, in front of your face. I like this, I like how Buddhism and Hinduism has felt very "direct" for my mind.
Part of the reason why I think I wish to look outside my religion, is because I feel like Judaism does not have a whole lot to offer me spiritually, or in terms of faith. Let me explain - the main spiritual powerhouse of Judaism has always been the commandments(mitzvot)/rituals. But as I am a Reform/Liberal Jew, I just simply do not view the mitzvot as binding, that we
must observe them. I've tried being observant but it has just never felt the right path for me. Interestingly, I very much like Jesus's view of the mitzvot - that they are made to enhance human life, to make human like more fulfilling rather than to restrict human life. I guess I've always thought of laws that are binding and a
must - which is how conservative/orthodox jews look at the law, to be more restricting than life enhancing, IMO. I like Jesus's idea that it is not what goes into a man that makes him unclean (i.e. keeping kosher), but that it is what comes out of a man, from the depths of his heart that tells if he is unclean. this is a greater focus of mine. So the point is, if I do not feel a strong connection with observing the mitzvot.. what exactly does Judaism have to offer me in terms of spirituality and developing faith? Historically the mitzvot have always been the gateway to experiencing God for Jews, but I just don't jive with this idea that well I guess.
Now, before you get super worried about me abandoning my Jewish ties, I will say this: The Oneness of God and the connectedness of all things has always been my sole intuition about life, and the core Jewish Belief that God is One (the Shema) is something I will always hold onto and never let go of, for it reverberates in my soul. So in this sense, Judaism will always be a "root" of my being, something that anchors me and that I can always come back to, to connect with at any moment. But that being said, I feel completely free to explore eastern religions right now, and I've been finding it extremely fulfilling. Its just where my path has taken me, and I'm very excited to see where it takes me.. I am sure Judaism will always play a role in that path.