Germany's Cdl. Walter Kasper is taking Cdl. Gerhard Müller to task for saying the Trinity and the Incarnation set Christianity apart from all other religions.
In his public testimony of faith released Friday, Cdl. Müller distinguishes the Christian belief in the Trinity and Incarnation from the faulty notions of God contained in all other religions.
"The distinction of the three persons in the divine unity (CCC 254) marks a fundamental difference in the belief in God and the image of man from that of other religions," wrote Müller. "Religions disagree precisely over this belief in Jesus the Christ. He is true God and true Man, conceived by the Holy Spirit and born of the Virgin Mary."
He added, "We are to resist the relapse into ancient heresies with clear resolve, which saw in Jesus Christ only a good person, brother and friend, prophet and moralist."
Two days after the release of Müller's "Manifesto of Faith," Kasper, an advocate for admitting the divorced and remarried to Holy Communion, singled out these words of Müller for critique.
"It is undoubtedly true that the confession of the Triune God constitutes a fundamental difference in belief in God and the image of man from other religions," said Kasper. "But are there not similarities, especially with the Jews and the Muslims, in the belief in the one God? And are not these similarities today fundamental to peace in the world and in society?"
Other cardinals have weighed in specifically on Islam, saying it's not the same God as worshipped by the Christians. Cardinal Raymond Burke, former head of the Vatican's highest court, is one such cardinal. During an interview in 2016, Burke said he thinks Catholics and Muslims aren't worshiping the same God:
I don't believe it's true that we're all worshipping the same God because the God of Islam is a governor. In other words, fundamentally Islam is, Sharia is their law, and that law, which comes from Allah, must dominate every man eventually. And it's not a law that's founded on love.