If Jesus came down today and said He is the Son of God / God, the Muslims will crucify Him because they are expecting Him to say He is Muslim (which He is NOT). Secondly, Allah is not the Father and He cannot have a Son without a consort. Hence, calling yourself Son of God is blasphemy according to Islamic belief. Just like the Jews accused Jesus of blasphemy, the Muslims will do just the same. Islam is anti-Christ. Period.