We present a Reformed view on the relation between Christianity and non-Christian religions. We then explore what this view entails for the question whether Christians and non-Christian religious believers refer to, believe in, and worship the same God. We first analyze the concepts of worship, beliefin, and reference, as well as their interrelations. We then argue that adherents of the Abrahamic religions plausibly refer to the same God, whereas adherents of non-Abrahamic religions do not refer to this God. Nonetheless, it would be wrong to say that adherents of all Abrahamic religions believe in and worship the same God.