The question being answered today:
The core differences that separates our two faiths is the fact that Islam rejects the divinity of Jesus Christ whereas Christians acknowledge Him as the Messiah and Son of Almighty God. Jesus himself made this very clear to us as we read in scripture:
For Christians, acknowledging and believing in the divinity of Jesus Christ is essential. One cannot call themself a Christian if they do not believe that Jesus is both fully human and fully divine, and that he and the Father are one.
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For more information about Islam, go here ("Islam in a Nutshell", Catholic Answers).