What is the Biblical basis against Melchizedek being the Holy Spirit?

A friend of mine is part of a church that teaches that Hebrews 7 indicates that Melchizedek is the Holy Spirit. What are the arguments against this view? For reference, here is Hebrews 7:15–21 (NIV) : > **Jesus Like Melchizedek** > > 15 And what we have said is even more clear if another priest like > Melchizedek appears, 16 one who has become a priest not on the basis > of a regulation as to his ancestry but on the basis of the power of an > indestructible life. 17 For it is declared: > > > “You are a priest forever, > in the order of Melchizedek.” >18 The former regulation is set aside because it was weak and useless 19 (for the law made nothing > perfect), and a better hope is introduced, by which we draw near to > God. > > 20 And it was not without an oath! Others became priests without any > oath, 21 but he became a priest with an oath when God said to him: > > > “The Lord has sworn > and will not change his mind: > ‘You are a priest forever.’” It's also written in Hebrew 7:3 (KJV), > Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually. I am a bit confused here. Anbody?