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I have not negated the Cross by my statement. you will also recal Jesus saying: "The things I do you will do also--" Perhaps if we we want results there are some prerecquisitionsmost scriptures point to the cross as the victory over the devil, one puts fasting on man's glory, another gives God the glory, see col 2:15, that is where the defeat came, the cross.
Paul speaks of the cross, and resurrection, not so much on fasting, see col 3, death, then resurrection. Gal 5:24-25, and Rom 6
Actually Matt. 17.21 is one of those missing verses in every reputable modern translations of the Bible (ESV, NIV, NLT, GNT, ERV, CJB, etc. see here) and is relegated to a footnote to explain why it is a dubious inclusion into the original. In my opinion, based on this, Jesus NEVER said This kind goes not out without prayer and fasting. Personally, through the years, I have cast out many demons and have yet to fast in order to accomplish the feat. I simply exercised the authority of Jesus name. Otherwise, there is nothing I have done or could ever do to subjugate a demon to my will.
That seems to be my experience as well. But often I've seen people get legalistic about the fasting. It kinda seems perhaps the fasting/prayer can break the unbelief and perhaps move someone into faith. But again, not trying to get legalistic about it. The source is Christ and the cross.
The question I have usually is are we missing something by not humbling ourselves in time of prayer/fasting. And, I'm not talking about all the crazy legalistic fasting founded on pride. I mean a true heart felt humbling ourselves to seek the one true God in prayer with fasting.
Probably, but the whole idea of fasting has been skewed, IMO. The practice, at least the way it is done today, seems very works-oriented to me. Its like saying, If I punish my body enough God will be forced to do what I want or, at least, I will be able to whip myself to some spiritual level that meets Gods requirements (like the Flagellants of the Middle Ages, see here). I know fasting is a NT practice but I am not so sure that we fast for the right reasons. Jesus disciples did not fast (Mark 2.18-19) and when Jesus was questioned about it he said that as long as the bridegroom was with them they did not need to fast. I am wondering if that meant physically with them, or spiritually with them? I know the bridegroom is spiritually with melo ,I am with you always, he said. He is even in meso, do I need to fast? What do you think?
True.
Most of my encounters with demons has not been after a period of fasting, but often unexpected, when I do not have an opportunity to fast, sometimes I do not have an opportunity even to pray. My last encounter came after the owner of our local Christian bookstore called me. He had closed his store because there was a young woman manifesting and who had thrown up on the floor. He asked me to come and cast the devil out of her. That was a tall order and I certainly did not have a chance to fast. I simply got in my car, prayed for grace, went into the store, and exercised my authority over demons in Jesus name. It really was a simple as that. No fasting or extended prayer session, no spinning heads or levitation, no foaming at the mouth, just a simple exercise of authority. Of course, not all of my encounters with demons has been this simple, one in particular took some time, but none of them that I recall required fasting. 
