I agree with John W. Kennedy. “Dont’ push your luck with God.”
The last 12 verses in the KJV don’t appear in the oldest manuscripts–some of which were not discovered, or unavailable, when the King James Version was being translated.
Besides, in 1 Corinthians Paul pointed out that the “special gifts” early Christians had would vanish. Indeed, just becausue Jesus himself resurrected Lazarus, among others, from the dead, that did not make everyone believe him–and I doubt that, these days, handling snakes with impunity would make people believe in him, either–if they did not want to be convinced.