Show me a verse saying that Jesus has always existed. SHOW ME. I challenge you, it doesn't exist. Yes he did exist before the creation of the heaven and the earth, and in fact he spoke it into existence, but water also existed before the creation of the heaven and earth.... it doesn't indicate that it has always existed. You have your own theology on things that were taught to you and you just cant let go.
Heb 7:1 For this Melchisedec, king of Salem, priest of the most high God, who met Abraham returning from the slaughter of the kings, and blessed him;
Heb 7:2 To whom also Abraham gave a tenth part of all; first being by interpretation King of righteousness, and after that also King of Salem, which is, King of peace;
Paul is likening Melchisedec as a type for the true or anti type Christ.
Was Melchisedec the true king of righteousness? no but that is what his title was but for Christ he is actually the king of righteousness.
Was Melchisedec the true king of peace? no For him it was a title of the place he was king, but for Christ he actually is the king of peace.
notice type meets anti-type. Or figure meets reality.
lets continue in the same fashion:
Heb 7:3 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.
Was Melchisedec really without father or mother? no He was born of someone but there is no record but Christ really is without father of mother. now this one is interesting because we know that He speaks of His Father after he stepped down and became a servant. So this must apply to Him before he humbled himself.
Heb 7:3 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.
Was Melchisedec without descent? no but Christ is literally without descent before his humbling.
Did Melchisedec not have a beginning or end, No all men died but Christ is without beginning he always was. In this he was made like the Son of God.