There is no evidence that people have genetic limitations.
A man who believes that he has no genetic limitations and can fly like a bird then proceeds to jump off a cliff is a dead man. We all, at present, have a final limitation, and that is death. The universality of death is evidence of genetic limitations. Unless that is of course you believe in the whole heaven narrative.
This is assuming that science does not progress to the point where we can in fact fly or perpetually avoid death.