What?
You're saying that the atheist would perform a voodoo ritual on an injured person?
Sorry, the stupidity lies with you.
Like it or not, voodoo is not Satan worship or "demonic intervention", but an amalgamation of various West African religions and Roman Catholicism, caused by the forced conversion of slaves during the height of the salve trade. They integrated a lot of the Catholic saints into the calendar and ceremonies. Google Loa.
I'm sure the atheist wouldn't care one way or another if a third party said a prayer to God or conjured up a loa ritual.
What difference would it make if you're an atheist?