Let me tell you a secret: After my bar-mitzvah (the ceremonial step from childhood into adulthood for young Jewish men), I was convinced that I had learned everything Judaism had to offer. I could read Hebrew, lead the prayers; I knew Torah stories, could even offer some midrash (commentary). So, I said, my journey in Judaism is complete.
I pursued spiritual fulfillment from other traditions, and I ultimately settled into Paganism, and Wicca in particular, for about three or four years.
Then, well, then I was Jewish again. Let me explain.