Faith itself is the capacity to “accept.” So, your argument that grace is required to accept the gift of faith simply begs the question: Is the faith, necessary to accept the gift of grace to accept the gift of faith, a gift?
Either I am freely given the grace and faith to accept the gift of salvation, or else salvation is not really a free gift at all. It is something I must work for and therefore it is something, that once achieved, I can boast about…“look here…I am a good person because I have achieved grace in the sight of God…but you are an evil person because you have not.”
DS 1525 - Council of Trent - session 6 - Chapter 5
The necessity for adults to prepare themselves for Justification and the origin of this Justification.
The beginning of justification must be attributed to God’s prevenient grace through Jesus Christ [can. 3], that is, to his call addressed to them without previous merits of theirs. Thus, those who through their sins were turned away from God, awakened and assisted by His grace, are disposed to turn to their own justification by freely assenting to and cooperating with that grace [cann. 4 and 5]. In this way, God touches the heart of man with the illumination of the Holy Spirit, but man himself is not entirely inactive while receiving that inspiration, since he can reject it; without God’s grace, he cannot by his own free will move toward justice in God’s sight [can. 3]. Hence, when it is said in Sacred Scripture: “Return to me and I will return to you” [Zech 1:3], we are reminded of our freedom; but when we reply: “Restore us to yourself, O Lord, that we may be restored” [Lam 5:21], we acknowledge that God’s grace precedes us.
First Vatican Council - Dei Filius - Chapter 3 - Faith
Now, although the assent of faith is by no means a blind movement of the mind, yet no one can accept the gospel preaching in the way that is necessary for achieving salvation without the inspiration and illumination of the Holy Spirit, who gives to all facility in accepting and believing the truth [20] .
And so faith in itself, even though it may not work through charity, is a gift of God, and its operation is a work belonging to the order of salvation, in that a person yields true obedience to God himself when he accepts and collaborates with his grace which he could have rejected.
Second Vatican Council - Dei Verbum
5… To make this act of faith, the grace of God and the interior help of the Holy Spirit must precede and assist, moving the heart and turning it to God, opening the eyes of the mind and giving “joy and ease to everyone in assenting to the truth and believing it.”
Catechism of the Catholic Church
153…Faith is a gift of God, a supernatural virtue infused by him. “Before this faith can be exercised, man must have the grace of God to move and assist him; he must have the interior helps of the Holy Spirit, who moves the heart and converts it to God, who opens the eyes of the mind and ‘makes it easy for all to accept and believe the truth.’”