realistically? aliens
them aliens p**** . we gonna have to do it ourselves
Who and me?
Seeing that humanity has abandoned the ideals which He instilled within us long ago God will send his mightiest angels unto mankind in an attempt to rid the world of His once dear creation. Humanity though will take up this challenge and commence a holy war against these angels, using the remains of neutralized angels Man will bio-engineer weapons capable of ascending into Heaven in efforts to destroy The One Above All.
geoengineered climate disasters > birdflu > war > aliens