Not trying to be rude when I say this
But I will try and answer your question if you will first answer this.
Continue the next verse in Mark you posted.
Mark 16:17-18 KJV
[17] And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; [18] They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
Show me the believers with those signs. Or maybe you would like to cast out some devils, speak in a language you’ve never learned, use your gift of healing, take up a deadly serpent, and drink something deadly?
I didn’t think so
My point is, something has changed.