Again, this is talking about Christ as mediator, this is Christ solely as savior. Christ's office of mediator pertains to more than just his church. For example:
1 Timothy 2:5 - For there is one God, and one mediator between God and men, the man Christ Jesus. (I don't see him only being the mediator of elect Christians here, in fact, a command is given that
"supplications, prayers, intercessions, and giving of thanks, be made for all men; For kings, and for all that are in authority; that we may lead a quiet and peaceable life in all godliness and honesty. For this is good and acceptable in the sight of God our Saviour;" in the preceding verses. Granted, your rejection of the concept of common grace would probably lead you to imagine away what most of this chapter is saying.)
Hebrews 1:2 - Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds. (This is what is cited in the WCF regarding Christ's status as being heir to all things and whom through all was created, not just the elect).
Acts 17:31 - Because he hath appointed a day, in the which he will judge the world in righteousness by that man whom he hath ordained; whereof he hath given assurance unto all men, in that he hath raised him from the dead. (Since it is Christ whom judges the world, his task as mediator goes beyond his church to include all of mankind, and indeed all of mankind will be raised up for judgment day. Clearly, Christ's role as mediator goes WELL BEYOND election)
I really suggest going through the WCF on the topic of Christ as mediator and consider all of the scriptures cited in support of this position rather than constantly harping over your own private interpretation of Hebrews 8, which is only talking about his role as the Savior of his Church. You can read it
at this link.
And since your continuing point is that Baptism has to ONLY be administered to those who are regenerate, how will you know anyone's heart? Again, but this logic, we should all become Quakers and give up on baptizing by water entirely.
Christ was the mediator as the Son of God in the Old Covenant, it was simply through types and shadows in the OT ceremonies. The outward signs changed and the new covenant has given us the fullness of Christ, but His intercession is for all of his Church, which includes the Old Testament saints. There is no lack of continuity between the Old and New Testament, not a single iota.
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