Do share those prophecy verses please @Ahmad.
But you didn't answer my actual question, which was why people who had converted to Islam would be called "Christians" in the Quran. Please share where you get this idea from, that people can convert to follow Muhammad but still be called Christian and not Muslim, showing where it says this in the Bible or the Quran, or failing that in the Hadith. Personally, I think that by thinking these people are actually following Muhammad, you are denying the plain words of your own scriptures - hence why I am asking you to determine whether this idea truly did come from scripture, or is an error you are making.
But you didn't answer my actual question, which was why people who had converted to Islam would be called "Christians" in the Quran. Please share where you get this idea from, that people can convert to follow Muhammad but still be called Christian and not Muslim, showing where it says this in the Bible or the Quran, or failing that in the Hadith. Personally, I think that by thinking these people are actually following Muhammad, you are denying the plain words of your own scriptures - hence why I am asking you to determine whether this idea truly did come from scripture, or is an error you are making.