That is...

That is, if we accept baptism as a part of the Gospel message, then we must accept casting out devils, speaking in tongues, handling serpents, drinking poison without being hurt, and healing the sick by laying on hands. Mark 16:17-18.

“And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; 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.” There are episodes described in the four Gospels and in the Book of Acts which describe all of these events as taking place. But they are not essentially and intrinsically the message of the Gospel.