I assume that as a Catholic, he believed in the Trinity, and believed in the divinty of Christ, and believed in the redemption on the cross.
To say that one knows the claims of the Church [or even the basic credal positions of Christianity] does not imply that a given individual ever accepted those claims.
There is a growing Noahide movement. Individuals who were
raised as Christians come to realize that they are, spiritually,
“at home”…with Israel.
That God is One, not three in One.
Noahides love God, and are moved - by Him - to
accept the Noahide…reality -----> Gentiles, acknowledging
the God of Israel, and praying “alongside” Israel.
A Christian may say: God cannot “call” a person to “error.”
And that, of course, would contain the assumptions -
-Jesus of Nazareth was both God and Messiah
-God is Three Persons, in one God
A given Noahide might say:
“That is what I was taught…but I’ve always sensed - and
now I know - that God is One, not three in One.”
It is a matter of : conversion…not in the sense
of seeking inclusion within Judaism, but in the sense of
accepting the Noahide reality. “As a Gentile, I accept
the God of Israel…”
"Shema Yisrael Adonai Eloheinu Adonai Echad."
And, were a Christian to claim: “…to accept the God of
Israel, is to accept His plan of salvation, which means
accepting Jesus of Nazareth, as Messiah…He is the
fulfillment of God’s Promise to Israel…”
the Noahide may reply: that is your belief…not mine.
As I say, the Noahide movement is growing. It may be
difficult to comprehend this - but, among Noahides, a Christian
assement of their chances for salvation, is a matter
of…indifference. For they have found God, through His
mercy, and their joy is complete.