@fatemasha3ban { لَقَدْ كَفَرَ الَّذِينَ قَالُوا إِنَّ اللَّهَ ثَالِثُ ثَلَاثَةٍ وَمَا مِنْ إِلَهٍ إِلَّا إِلَهٌ وَاحِدٌ}
السورة ورقم الآية: المائدة (73).
I don't know if you speak Arabic or not but it basically means that anyone who believes that there are 3 gods is a kafir.
{لَقَدْ كَفَرَ الَّذِينَ قَالُوا إِنَّ اللَّهَ هُوَ الْمَسِيحُ ابْنُ مَرْيَمَ}
السورة ورقم الآية: المائدة (17).
It says that all who believes that God is Jesus is a kafir
{ وَقَالَتِ الْيَهُودُ عُزَيْرٌ ابْنُ اللَّهِ وَقَالَتِ النَّصَارَى الْمَسِيحُ ابْنُ اللَّهِ ذَلِكَ قَوْلُهُمْ بِأَفْوَاهِهِمْ يُضَاهِئُونَ قَوْلَ الَّذِينَ كَفَرُوا مِنْ قَبْلُ قَاتَلَهُمُ اللَّهُ أَنَّى يُؤْفَكُونَ * اتَّخَذُوا أَحْبَارَهُمْ وَرُهْبَانَهُمْ أَرْبَابًا مِنْ دُونِ اللَّهِ وَالْمَسِيحَ ابْنَ مَرْيَمَ وَمَا أُمِرُوا إِلَّا لِيَعْبُدُوا إِلَهًا وَاحِدًا لَا إِلَهَ إِلَّا هُوَ سُبْحَانَهُ عَمَّا يُشْرِكُونَ}
{التوبة:30-31}.
This means: The Jews say, "Ezra is the son of Allah "; and the Christians say, "The Messiah(christ) is the son of Allah." That is their statement from their mouths; they imitate the saying of those who disbelieved [before them]. May Allah destroy them; how are they deluded?
They have taken their scholars and monks as lords besides Allah, and [also] the Messiah, the son of Mary. And they were not commanded except to worship one God; there is no deity except Him. Exalted is He above whatever they associate with Him.
So the Christians and jews nowadays are kafireen but there are a lot of types of Christianity and Judaism and I'd like to think that is there are some who believe in one God secretly. Besides the prophet Mohamad didn't call them kafireen he called them Yahood and Nasara, so as a way of following in the prophet's footsteps and as a way of not judging every Christian and Jew out there that he is a kafir without knowing his inner soul I learned that it is better to call them Yahood and Nasara.