Prayerfully consider these verse

2Thess 2:9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
 10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
 11 And for this cause God shall send them strong delusion, that they should believe a lie:
 12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.

Men come after the working of Satan, not necessarily worshipers of Satan, with Power and signs and lying wonders.  so casting out demons is nothing to me. You disobey the word of God, and practice unrighteousness in that disobedience dispite what the word of God says.  You ahve pleasure in it and it makes you feel like your more superior than other Chrisitans.  But you are not you are delusioned and believe not the turth of God's word as found preserved in his Holy Bible.

You want to show me your spiritual worth show me your obedience to the word of God.  signs can be from the devil.

So far your boasting fasts is in disobedience.  practicing things that are not taught to the church via the Holy Ghost, placing musical worship above study of the word of God (disobedience again).  You truly draw close to him with your mouth but your heart is far from him in your deeds especially in the way your treat the word of God, the holy scriptures.