Bs"d
Why believe in a messiah who didn't fulfill the messianic prophecies?
http://MountZion.notlong.com
Given the errancy of works attributed to the old testament prophets; you can't even say what the last messiah really was. Certainly, god made a fully human being, otherwise the human's suffering would be meaningless; And certainly, he didn't resurrect god himself from the dead, because it would be ridiculous for god to himself from to prove that he can raise the dead. It absolutely was necessary for God to sacrifice a man and raise him from the dead.
The other concepts of last messiah are shams, including the trinitarian concept.