The only parts of religion that secular morality accepts are the charitable aspects — e.g., help people, be nice, give charity, don’t harm others — and the self-improvement aspects — e.g., be mindful, be grateful, be patient, etc.
But, at its core, worship in Islam is not encompassed by either of those dimensions.
Worship is about being a slave.
It is about doing what your Maker commands you to do.
It is about lowering yourself to such an extent that you realize the reality of your existence: A small, weak creature, who came into being through no power of his own, persists through no power of his own, and will die and return to dust, ceasing to exist.
Ironically, secular morality understands that last part, but stubbornly denies the whole point of it, which is this: The only thing that has significance and meaning given such a reality is obedience to the One who has all power.
Reason recognizes this.
But it is not only rationality that secular morality lacks. It also lacks humanity. Our humanity, in its essence, understands viscerally that eating, sleeping, copulating are passing, finite pleasures that can mean nothing next to the looming abyss of nonexistence.
Only by destroying that humanity can secularism overcome faith in the Creator, thereby sending its adherents headfirst into that very abyss they tried so hard to ignore.
ٱعْلَمُوٓا۟ أَنَّمَا ٱلْحَيَوٰةُ ٱلدُّنْيَا لَعِبٌۭ وَلَهْوٌۭ وَزِينَةٌۭ وَتَفَاخُرٌۢ بَيْنَكُمْ وَتَكَاثُرٌۭ فِى ٱلْأَمْوَٰلِ وَٱلْأَوْلَـٰدِ ۖ كَمَثَلِ غَيْثٍ أَعْجَبَ ٱلْكُفَّارَ نَبَاتُهُۥ ثُمَّ يَهِيجُ فَتَرَىٰهُ مُصْفَرًّۭا ثُمَّ يَكُونُ حُطَـٰمًۭا ۖ وَفِى ٱلْـَٔاخِرَةِ عَذَابٌۭ شَدِيدٌۭ وَمَغْفِرَةٌۭ مِّنَ ٱللَّهِ وَرِضْوَٰنٌۭ ۚ وَمَا ٱلْحَيَوٰةُ ٱلدُّنْيَآ إِلَّا مَتَـٰعُ ٱلْغُرُورِ
“Know that the life of this world is but amusement and diversion and adornment and boasting to one another and competition in increase of wealth and children – like the example of a rain whose [resulting] plant growth pleases the tillers; then it dries and you see it turned yellow; then it becomes [scattered] debris. And in the Hereafter is severe punishment and forgiveness from Allah and approval. And what is the worldly life except the enjoyment of delusion.” -Quran 57:20