As a believer, I can confirm God does operate through Believers doing miraculous signs – before, now, and forever.
Read: Mark 16:17-18
17 These miraculous signs will accompany those who believe: They will cast out demons in my name, and they will speak in new languages. 18 They will be able to handle snakes with safety, and if they drink anything poisonous, it won’t hurt them. They will be able to place their hands on the sick, and they will be healed.”