And if I may add; "These signs will accompany those who have believed: in My name they WILL cast out demons, they will speak with new tongues; Mark 16:17
Notice how Jesus didn't say, "Could, might, maybe, perhaps, potentially..." no he said WILL. The biggest lie the enemy has been able to get good Christian people to buy into is; "I'm a Christian and Christian's can't be spiritually oppressed, I've accepted Jesus!" That's about equivalent as saying, "Now that I have Jesus in my house, cockroaches can't enter." A person can have ALL the Jesus in their hearts, but if they have a dirty house (mind, body, soul), the cockroaches (demons, evil spirits, unclean spirits) WILL get in... and stay until they are "CAST OUT".
A great example of a strong defense against the enemy is Ephesians 6:10 by putting on the armor of God and Jesus gives us the biggest Blessing of a strong offense in Mark 16:17.
Excellent post New Nature and thank you. God Bless!
Greg