﴿ إِنَّ ٱللَّهَ رَبِّى وَرَبُّكُمْ فَٱعْبُدُوهُ ۗ هَٰذَا صِرَٰطٌۭ مُّسْتَقِيمٌۭ ﴾

“"Verily, God is my Sustainer as well as your Sustainer; so worship Him [alone]: this is a straight way."”

(Lo! Allah is my Lord and your Lord, so worship Him) declare his divine Oneness. (That) divine Oneness (is a straight path) an established religion, Islam, which He is pleased with.