You have no interest in the truth about deliverance, which is why you still refuse to obey Jesus's direct instructions.
But even allowing for your false claim that the end of Mark is not original, throughout his ministry on earth, Jesus cast many demons out and instructed the apostles to do the same.
And scripture shows that it continued among the believers, after Jesus ascended.
And given that the power to cast demons out belongs solely to Christians, (witness the seven sons of Sceva), then your failure to obey is an abdication of responsibility.
Whether you like it or not, you should be casting demons out of either believers, or unbelievers, your choice but get on and do it!
The following definitively proves Jesus cast demons out of believers!
Luke13v10And He was teaching in one of the synagogues on the Sabbaths. 11And behold, a woman having a spirit of infirmity eighteen years, and she was bent over and not able to lift herself up to the full. 12And having seen her, Jesus called her near and said to her, “Woman, you have been freed from your sickness.” 13And He laid the hands upon her, and immediately she was made straight and began to glorify God.
You will note that her sickness is caused by
a spirit of infirmity.
14And answering, the ruler of the synagogue, indignant because Jesus had healed on the Sabbath, was saying to the crowd, “There are six days in which it behooves one to work. Therefore coming, be healed in these, and not on the day of the Sabbath.”
Just like today, the indignant theologians hate every expression of spiritual life because it undermines their theological supremacy!
15Therefore the Lord answered him and said, “Hypocrites! Does not each one of you untie his ox or donkey from the stall on the Sabbath, and having led it away, give it to drink? 16And this, being a daughter of Abraham whom Satan has bound, behold, eighteen years, ought she not to be loosed from this bond on the day of the Sabbath?”
Jesus casts a spirit of infirmity out of a daughter on Abraham.
Son/daughter of Abraham is a definition of a faithful believer, as later stated by Paul.
Gal3v6So also, “Abraham believed God, and it was reckoned to him as righteousness.” 7Know then that those of faith, these are sons of Abraham.
Jesus would say the same to you cessationists,
"Hypocrites, ought not these sons and daughters of Abraham be loosed from their bondages!"