When one begins to search for Religion, it is best to go to the origin and evaluate the story of the history of the original revelation of that faith. Judaism is known to have started with Abraham who taught people to G-d and brought them to monotheism.
The Jewish Nation and their official begining and their official beginning was an event known as the revelation of recieving the Torah at Mount Sinai. The Torah testifies that there were 600,000 men between the ages of 20 and 60. With simply adding one wife per male plus adding all those above 60 years old, you would have close to or more than 3 million people.
The amazing aspect of this revelation is that it was a "public event" and that each person there heard G-ds' voice speak the first two commandments. Everyone there had a similar experience.
Do you believe that if G-d were to undo such an event, which he certainly didn't, He would do it through one single messenger? He would need to have at least an equal size notification of his change. no one denies the "SINAI" experience.
We as Jews owe it to ourselves to learn our heritage in order to reconnect to that which each of us wittnessed at Sinai. Let's not sell our G-d and our Religion short. We know the truth, We have the truth, Lets keep the truth!!