We were never meant to live forever in these bodies. Death is part of the system, and always has been. God allows people to die because everything in nature dies.

And what makes you think God is killing people (as if malicious, cruel, or irrational) with plagues/natural disasters? I'm guessing you have a barrier about seeing God as anything other than acerbic.

Why does the Christian deity allow people to die, and why does he kill others with plagues/natural disasters?