One Religion (Din al-Islam) in the Holy Quran

﴿إِنَّ ٱلدِّينَ عِندَ ٱللَّهِ ٱلۡإِسۡلَٰمُۗ وَمَا ٱخۡتَلَفَ ٱلَّذِينَ أُوتُواْ ٱلۡكِتَٰبَ إِلَّا مِنۢ بَعۡدِ مَا جَآءَهُمُ ٱلۡعِلۡمُ بَغۡيَۢا بَيۡنَهُمۡۗ وَمَن يَكۡفُرۡ بِـَٔايَٰتِ ٱللَّهِ فَإِنَّ ٱللَّهَ سَرِيعُ ٱلۡحِسَابِ ﴾ [Āl-‘Imrān: 19]

(19) Indeed, the religion in the sight of Allah is Islam. And those who were given the Scripture did not differ except after knowledge had come to them - out of jealous animosity between themselves. And whoever disbelieves in the verses of Allah, then indeed, Allah is swift in [taking] account.

Surah: Āl-‘Imrān - Verse: 19 - Juz: 3 - Page: 52

﴿وَمَن يَبۡتَغِ غَيۡرَ ٱلۡإِسۡلَٰمِ دِينٗا فَلَن يُقۡبَلَ مِنۡهُ وَهُوَ فِي ٱلۡأٓخِرَةِ مِنَ ٱلۡخَٰسِرِينَ ﴾ [Āl-‘Imrān: 85]

(85) And whoever desires other than Islam as religion - never will it be accepted from him, and he, in the Hereafter, will be among the losers.

Surah: Āl-‘Imrān - Verse: 85 - Juz: 3 - Page: 61

﴿وَإِنَّ ٱللَّهَ رَبِّي وَرَبُّكُمۡ فَٱعۡبُدُوهُۚ هَٰذَا صِرَٰطٞ مُّسۡتَقِيمٞ ﴾ [Maryam: 36]

(36) [Jesus said], "And indeed, Allah is my Lord and your Lord, so worship Him. That is a straight path."

Surah: Maryam - Verse: 36 - Juz: 16 - Page: 307

﴿وَمَآ أَرۡسَلۡنَا مِن قَبۡلِكَ مِن رَّسُولٍ إِلَّا نُوحِيٓ إِلَيۡهِ أَنَّهُۥ لَآ إِلَٰهَ إِلَّآ أَنَا۠ فَٱعۡبُدُونِ ﴾ [Al-Anbiyā’: 25]

(25) And We sent not before you any messenger except that We revealed to him that, "There is no deity except Me, so worship Me."

Surah: Al-Anbiyā’ - Verse: 25 - Juz: 17 - Page: 324

﴿إِنَّ هَٰذِهِۦٓ أُمَّتُكُمۡ أُمَّةٗ وَٰحِدَةٗ وَأَنَا۠ رَبُّكُمۡ فَٱعۡبُدُونِ ﴾ [Al-Anbiyā’: 92]

(92) Indeed this, your religion, is one religion, and I am your Lord, so worship Me.