to continue:
many look to "measure of faith" as a reference to all men but that isn't the case. note Paul speaks to the brethren here not to the whole of man:
Rom 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service. 2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God. 3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith. 4 For as we have many members in one body, and all members have not the same office:
so if it be "your faith" then why hasn't men been saved without Christ if one's own faith is sufficient? consider, in the garden didn't Eve trust and or believe (faith) what the serpent said? that didn't bring any salvation did it?
God is Faithful, simple as that, and that is the Faith of Christ. one could even say the Faith of Abraham and the rest.
no one believes or trust what they don't know, and knowing comes by revelation. flesh can't discover spirit, but spirit can reveal itself to flesh. so, how can any man have faith in the Word of God unless it is revealed to that person that it is of God. even flesh can acknowledge power if it is revealed to the flesh that the power is.
no one raises themselves from the dead by their own faith. you shall be raised by the Faithfulness of God which is the faith of Christ. it take God's Faithfulness to keep you because you don't have the faith to keep yourself. hence the constant failure, or doubt. your faithfulness is Christ just as your righteousness is Christ, your justification is Christ.
the life of the flesh has no justification in Heaven or the Presence of God, therefore only the Life of Christ can save you. so, that which is of that Life lives not what is of the "old man".