The Torah speaks nowhere about a 'second coming'. The Messiah is supposed to do his work as soon as he comes. It's been 2000 years, and no messayaroony miracles in sight... You can see why the Judeans are sceptical.
As an "atheist" you'd be better off being silent on things you don't know and don't accept.
You couldn't be more wrong. Clues of the coming of Jesus are all over the Old Testament. It's all in how you interpret the evidence. The Jews didn't expect their Messiah to have a humble birth and they also expected the Messiah to free them. Neither happened, so Jesus did not meet their expectations hence the disbelief. All I can say from a secualar point of view is the NO human has had such a dramatic impact on the human race. No one! Sure they can change A.D. and B.C. to common era but it will not erase Jesus.