There is no dispute among those who believe the Bible is God’s word concerning the reality of the miracles performed by Jesus and His disciples. Hebrews 2:4 is one of many references. Three words are used: “Dunamis” meaning power; “Terata” shows the impact of amazement and wonder, and “Semeion” emphasizes purpose, result or proof.
The purpose of miracles as recorded in the New Testament has not changed. They were never to merely impress or entertain, nor were they to benefit those who did them. They were (1) to show the power of God, (2) to produce conviction and faith, and (3) to confirm God’s word which was being revealed by the apostles (Acts 2, Acts 14, 15; I Cor 12; Mk 16:17-18). As the New Testament draws to a close, there are fewer and fewer recorded miracles, because once the truth had been delivered, confirmed and recorded, there was no more need for them (Jude 3).
Satan does “lying wonders, miracles and signs that deceive” (2 Thess 2:9-10). There are no genuine miracles (raising the dead, restoring withered arms, etc) performed today because there is no need.