I believe paradise on earth will only be created when every man and woman grows in love and awareness to the point where their thoughts and actions promote and contribute to life rather than detracting from it and destroying it.
I don't believe paradise will be achieved through the descent to Earth of some supernatural being from the heavens. This would still leave the problem of unenlightened humanity. For it would take more than the appearance of one person to suddenly enlighten everybody, I believe. After all, the original appearance of Christ and Buddha did not result in the sudden enlightenment of all humanity so why would a reappearance of either now be any different?