It is apparent that you know nothing of Catholicism or Islam (hint, Calvinism is pretty much re-branded Islam). Islam is not a Trinitarian faith, because the Abrahamic Covenant from which it mutated is not Trinitarian.
(And for the record I really don't want to hear your polytheistic nonsense again either. As a Catholic I am a monotheist and do not acknowledge the existence or even the possibility of existence of any other God than Jehovah.)
Hey, you're the one that posted it...You said the mention of God by a Catholic automatically presupposes the knowledge that the Trinity is included in the word God...
Then you go on to claim that muzlims believe in the same God and use Jesus and Mary to accentuate that belief with the Catholic belief in God...Unity at it's best...
Quit whining when someone calls you out on your unGodly, unBiblical Catholic beliefs that you so proudly boast about...
Calvinism is Bible based Christianity. Islam has nothing to do with the Abrahamic Covenant. Allah is not the Elohim of Abraham, Isaac and Israel. From Peter through the pen of Mark Mark 12:29 Jesus answered, "The foremost is, Breathtaking ignorance !
shalom b'SHEM Yah'shua HaMashiach Mark 12:28 One of the scribes came and heard them arguing,
and recognizing that He had answered them well, asked Him,
"What commandment is the foremost of all?"
'HEAR, O ISRAEL! YHvH OUR ELOHIM YHvH IS ONE
Deuteronomy 6:4