Religion is a powerful regulator of the lives of its adherents. A lot of wars in the history of mankind have been triggered by ideological differences. The belief in resurrection hinges on a fundamental belief and expectation of Christianity that Jesus will return to resurrect the dead and reward the virtuous. For some, this is the basis of doing good and thus expectation of reward. The transhumanism idea that technology can be used to bring dead bodies back to life and defeat death may not go down well. It is like providing an alternative resurrection to that of the Christ.
Transhumanism is an intellectual movement that is driven by the desire to make use of technology in order to reverse aging, defeat death and create super-humans with unimagined super-intelligence. The field would entail nutrition, hormonal therapies, brainwave research, computer brain interfacing, uploading consciousness from a dying person, and uploading to a cloned one and animal/human breeding.
Conventional religions which have a vast number of adherents in the world, such as Hinduism, Christianity, Islam and so on, believe in a God-created human being. The merging of machines and humans to create singularity in the form of a clone or virtual human is unwelcomed by them. It would imply establishing a parallel god and this might be opposed by them.
Sometimes, fear of death may make people conform and without this some may develop a misleading notion that one can get away with anything and use nanotechnology to induce war, disease, earthquakes and drugs to shorten life.
Although many religious explanations cannot be scientifically proven, it suffices to say they influence the culture and belief system of the vast majority of people in the world. A radical approach that attacks the very essence of one’s belief could have far-reaching repercussions, such as freezing funding for related researches.