You are not supposed to push your religious beliefs on b-hebrew. If you
want to discuss the messianic proof quotes, you have to pretend to be asking
questions about the meaning of the word "almah" or "betula" or some
grammatical issue in Isaiah 7:14. You can't just come right out and say
things that are meant to persuade people to believe that certain prophecies
were fulfillled by someone you believe was the messiah.
Lots of people on b-hebrew like to discuss the messianic proof quotes, but
they do it in a more subtle way.