I think you are on the right track, it does seem like a covenant of works...in contracts with the covenant of grace. The c of g is entered into by grace through faith and not physical linage whereas the c of w was entered into by virtual of birth.
Yes....one of the complications for me is thinking of the Covenants in terms of past, present, and future.
That would be a mixed covenant of grace, right?
There does seem to be some overlap or ties, it's especially evident to us with the covenant of redemption and the covenant of grace, some theologians make no distinction. I feel I am grossly unqualified on this subject, so (some of) my positions are soft (still learning), until I am given more understanding. So far as mixing the covenant of grace with works, I wouldn't or do not, at least not intentionally, if I have sorry for the confusion.
Where the physical descendents are in the covenant by simply being born, but are they not under their federal head Adam until they are brought into the covenant by faith?
Tough question. Seems all of us are born under the federal head of Adam, under the covenant of works, that much is clear. What is not clear is defining a point at which the children of believers are under the c of g. Another enigma, as Christians, are we no longer under the c of w in any respect? Christians are often quick to point out that we're "no longer under law but grace", but how about non-Christians? I am inclined to say that only upon monergistic regeneration does one enter the c of g under the federal head of Christ. So the question then becomes, can God not regenerate an infant if He so chooses? I say yes, what say you?
Faith is the evidence of their being in the covenant is it not?
Yes, saving faith in Christ manifested in Holy Spirit inspired works, or the Spirit of God working through faith in the believer is an evidence. Of course the problem with this so far as us being "fruit inspectors", is the reality of counterfeit works. Thank God for the gift of spiritual discernment.
I agree that credobaptism doesn't guarantee salvation but it does guarantee the person being baptized is baptized upon their profession of faith and seeking to follow the Lord obediently by being identified with His death, burial and resurrection.
I found an interesting article today, here is a quote:
"George Whitefield, who historians identify as the key preacher of the Great Awakening, refused to speculate on how many of his listeners had been converted. "There are so many stony-ground hearers which receive the word with joy," Whitefield said, "that I have determined to suspend my judgment till I know the tree by its fruits." -
SOURCE
A credobaptist doesn't seek to create what Presbyterians call 'covenant breakers' since we do not (Reformed Baptists anyway) believe the covenant of grace can be broken.
I do
not believe c of g can be broken either, and I am a paedobaptist. I openly confess that I do not have a perfect understanding of ct by any stretch of the imagination. It may be that I am inconsistent, but I cannot see it, I see as through a glass darkly. I do see where you're coming from assuming infant baptism were the entering point of the c of g, but I stand by my comment on monergistic regeneration.