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This is a unique understanding of God, a stumbling block to Jews and to Muslims. It is so easy to say things like: we all believe in the same God. In some sense this is true, if we limit it to God as the creator, the Father of all things. But our Jewish and Muslim brothers would deny that God is more than this.

So much for VC II's heretical Nostra Aetate:

3. The Church regards with esteem also the Moslems. They adore the one God, living and subsisting in Himself; merciful and all- powerful, the Creator of heaven and earth,(5) who has spoken to men; they take pains to submit wholeheartedly to even His inscrutable decrees, just as Abraham, with whom the faith of Islam takes pleasure in linking itself, submitted to God.

As Holy Scripture testifies, Jerusalem did not recognize the time of her visitation,(9) nor did the Jews in large number, accept the Gospel; indeed not a few opposed its spreading.(10) Nevertheless, God holds the Jews most dear for the sake of their Fathers; He does not repent of the gifts He makes or of the calls He issues-such is the witness of the Apostle.(11) In company with the Prophets and the same Apostle, the Church awaits that day, known to God alone, on which all peoples will address the Lord in a single voice and "serve him shoulder to shoulder" (Soph. 3:9).(12)

Romans 1:20 For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:

The Three-in-oneness of God is not a mastery, it can be observed by all things created. Thus dimly we see God’s nature and how he exists in the universe. For example man was made in God’s image. We have Body, Soul and Spirit, and a Body that can be separated.....this is jut s tiny speck of the knowledge of God you will find if you study the Creation. The Creation will speak if you listen...