Judaism is a complete religion, but you are fully entitled to have another belief system if you wish to. As I stated, Jews are not taught to be arrogant about their religion, merely to practice it. That's why we don't seek to convert.
Hardly anyone, other than someone who wants to get married....and my guess is that they cross their fingers when doing it, convert to Judaism. You have a true religion, just not a complete one. Truth is truth.....it's not meant to offend.