The signs shall follow them, not that all believers will perform them.
Mark 16: 19So then the Lord Jesus, after he spoke to them, was taken up into heaven and took his seat at the right hand of God.k 20But they went forth and preached everywhere, while the Lord worked with them and confirmed the word through accompanying signs.]l [And they reported all the instructions briefly to Peter’s companions. Afterwards Jesus himself, through them, sent forth from east to west the sacred and imperishable proclamation of eternal salvation. Amen.]
Who did Jesus work through? The Eleven. Not all believers.
Mar 16:17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
You can deny the red letters all you want...You can call Jesus a liar all day long...
Mark 16: 19So then the Lord Jesus, after he spoke to them, was taken up into heaven and took his seat at the right hand of God.k 20But they went forth and preached everywhere, while the Lord worked with them and confirmed the word through accompanying signs.]l [And they reported all the instructions briefly to Peter’s companions. Afterwards Jesus himself, through them, sent forth from east to west the sacred and imperishable proclamation of eternal salvation. Amen.]
Apparently you picked up someone's perverse commentary on the scriptures...You need to dump that but quick and start reading what God has to say about it...