That seems to me to be very clearly the teaching of Vatican II, the Catechism, and the current Pope both before and after his accession to the Papacy. I refer you to
Dominus Iesus, sects. 20-21, which clearly affirm the possibility that those who are not Christians may receive grace in a manner known only to God.
Edwin: receiving grace as a non-Christian is not only possible, but absolutely necessary, as it requires Godâs grace to have faith in the first place. This is why Dominus Iesus says, "Faith is a gift of grace: âin order to have faith, the grace of God must come first and give assistance; there must also be the interior helps of the Holy Spirit, who moves the heart and converts it to God, who opens the eyes of the mind and
gives âto everyone joy and ease in assenting to and believing in the truthâââ
However, receiving grace is not the same thing as receiving eternal life, justification, salvation, and the point of receiving the grace is to lead to believing in the truth, as stated above.
Dominus Iesus says that ââŚit is clear that it would be contrary to the faith to consider the Church as
one way of salvation alongside those constituted by the other religions, seen as complementary to the Church or substantially equivalent to her, even if these are said to be converging with the Church toward the eschatological kingdom of God.â
Then it says, âIf it is true that the followers of other religions can receive divine grace, it is also certain that
objectively speaking they are in a gravely deficient situation in comparison with those who, in the Church, have the fullness of the means of salvation. However, âall the children of the Church should nevertheless remember that their exalted condition results, not from their own merits, but from the grace of Christ.
If they fail to respond in thought, word, and deed to that grace, not only shall they not be saved, but they shall be more severely judgedâ. One understands then that, following the Lordâs command (cf. Mt 28:19-20) and as a requirement of her love for all people, the Church âproclaims and is in duty bound to proclaim without fail, Christ who is the way, the truth, and the life (Jn 14:6). In him, in whom God reconciled all things to himself (cf. 2 Cor 5:18-19), men find the fullness of their religious life.ââ
Seems pretty clear that even as Christians, members of the Church, we have to respond to the grace, Edwin. And it says that folks outside the religion are in an even worse situation than those inside the Church. They better respond, and we better get to telling them, eh?