Studying Judaism is what made this atheist become a Catholic. So long as you’re grounded in your faith, you will find nothing but treasures in Judaism. In my opinion, it is the only other “true” religion in the world; its error is in what it lacks, not in what it possesses. It is a true pursuit of God based on true faith and true scripture/tradition. So long as you keep it in perspective of the Messiah Jesus, there’s nothing but beauty in the Jewish faith.
In addition to the Tanakh, you should also check out the Talmud, which is the other key work in the Jewish faith. The Talmud is very much like the Catechism of the Catholic Church in that it both contains extra-Scriptural Sacred Tradition and comments on it. It’s VERY important to understanding Judaism, and more than a little in it actually points to Catholicism. For more information on that in particular, I recommend “
Salvation is from the Jews” by Roy Shoeman. You can also check out the
Association of Hebrew Catholics for a Jewish Catholic perspective. Another website and book is
Second Exodus.
The Jewish faith is the Tree of Life that Catholicism grows out of. I don’t even count Catholicism as something seperate from Judaism at all, but rather as the very Jewish recognition of Jesus as the Messiah. If you study Judaism, you will see how this is the case, and you will see that even Jews recognize something like the Church as possibly arrising with the the coming of the Messiah, they just don’t think he’s come yet. According to them we’ve jumped the gun, and according to us they’re slow to get on board. We are the same tradition of faith, however, and the founders and early members of the Catholic Church were all very devout Jews. Modern Judaism is pretty much the Pharisees carried into modern times, post-Temple. If Judaism can even truly be called “heresy”, it’s purely heresy of omission. I prefer to think of it as the earliest schismatic movement
Like I said, I was an atheist who studied Orthodox Judaism and became Catholic. It’s really good stuff. Benedict XVI even specifically reaffirmed our connection with Jews and Judaism in his inaugural homily.