How similar is Thiên chúa giáo and Islam?

There is nothing similar between Thiên chúa giáo and Islam. Christians and Muslims are totally different. It's not about "Muslims believe that Jesus was a prophet hoặc whatever.."
It's about The Shahada: "I chịu, gấu witness that there is no god but Allah, and I chịu, gấu witness that Muhammad (pbuh) is the servant and Messenger of Allah".

There are literally MANY differents, just like there are some few similarities. We muslims do not believe in Jesus as a God/God's son. He's our Prophet, like Prophet Mohammed. He is Meriam's son, who was one of the important women in đạo hồi like prophet Mohammed's daughter.
And Jesus name is Isaa in Islam. Prophet Isaa. He was able to do many things and could speek to God bởi revelations (God's Angels).

And the similarities between đạo hồi and Thiên chúa giáo are some rules, like not lying, give money to poor people, help others and such "ordinary" things, those not so many people follow.

And during the time the Bible has been totally changed. It used to be like an earlier Quran, which means that the former Holy Bible and the current Holy Quran (that never has been changed), used to be from the same originality; God. But the Bible came when prophet Isaa came and after the christinaries believes, a LOT of it has been changed AND new things have been added after the christinaries interpretations, for example that Jesus (Isaa) is God himself hoặc God's son. Compared to the Honly Quran that came during prophet Mohammed's when he was 40 years old, it has never been changed bởi muslims hoặc any others! But in the otehr hands đạo hồi has been divided in several different directions, for example: Shia muslims and Sunni muslims. But that has got with the Prophet Mohammed's family and so called "friends" to do. Sunni also take the Quran like they interpret it. But Shia muslims take it exactly as it is. They are literals.
I could keep talking about this in ages but so far so good, I guess xD

If u want to know, I am a Shia muslim.

maybe somthing wrong abaut your question

yes we believe Jesus as prophet not god after his death and we believe that our god "Allah" is one god ,but bạn believe that god three gods in one

we believe all prophets in Quran.Jesus Moses... Christianity,Judaism had.but then people changed them.final religion is đạo hồi and đạo hồi is word of Allah.not people. and finally something wrong in Thiên chúa giáo according to Islam. if Thiên chúa giáo had the best religion for people đạo hồi would not. i tình yêu đạo hồi and my prophet Hz Muhaammed(sav).he is the final prophet mercy to all mankind. do u know Sami Yusuf.

link

I'm Christian but I do believe that the Angel Gabriel came to the prophet Muhamed and told him to spred the word of Allah.