The aliens were killed by belief
The movie isn't an alien invasion movie; it's a movie about faith and redemption. It's the story of the lost and angry ex-Father Graham Hess' road to forgiveness and regaining the strength to be a father, brother and preacher and, most importantly, to accepting his wife's death and forgiving her killer.
The aliens are an ...
"Stitching guns" is a term used by the alien invaders of Earth in Christopher Anvil's "Pandora's Planet" (1956).
The aliens (other than interstellar flight) are roughly equivalent tech to Earth:
Brak Moffis looked at Horsip and gave a wry smile. "Technologically," said Moffis, "they were very near Centra 0.9, and in some ...
This is likely to be Pandora's Planet by Christopher Anvil, originally appearing in Astounding Science Fiction in September 1956.
It was later reworked into the start of a full-length novel, Pandora's Legions. An excerpt from the novel:
"What's wrong then?" demanded Horsip.
"The natives' stitching-gun," said Moffis dryly.