Does the Catholic Church teach that Christians and Muslims worship the same God? Matt Slick of the Christian Apologetics and Research Ministry (CARM) tries to answer the question but he's wrong about the Catholic position.

The Trinity is the central mystery of the Christian faith. The term describes the inner life of God, who is an eternal communion of Persons and a Family whose life is love. Is the concept of the Trinity a Christian invention, derived from Greco-Roman pagan ideas? Or do we already find hints of the Trinity in the Hebrew Bible and in Jewish sources?

The Trinity is a distinctively Christian idea, but it articulates the concept of G-d implicit in  the Jewish as well as the Catholic experience of G-d, for Jews, like Catholics, know G-d as Father (Source), as Son (Shekhinah), and as the Holy Spirit (His Love).