The Ultimate Plan Of The Disbelievers

What is the greatest agenda and the biggest evil planning and plotting of the disbeliever of the enemy of Allah, against the Believers, against those who say La Ilaha Illallah
Allah mentioned in the Quran,

وَلَا يَزَالُونَ يُقَاتِلُونَكُمْ حَتَّىٰ يَرُدُّوكُمْ عَن دِينِكُمْ إِنِ اسْتَطَاعُوا
[2:217]

Allah عَزَّ وَجَلَّ he says that they will continue لَا يَزَالُونَ means they will continue to figh you, fighting here is not limited to weapons. they will fight you with their ideology, their belief, their propaganda, whatever it is, why? why are they doing this?
حَتَّىٰ يَرُدُّوكُمْ عَن دِينِكُمْ إِنِ اسْتَطَاعُوا
So that they may let you apostate from your religion, turn your back from your deen, abandon your Islam.

If they are able to do so, this is what they want, this is the plan, Allah عَزَّ وَجَلَّ warns us,

وَمَن يَرْتَدِدْ مِنكُمْ عَن دِينِهِ فَيَمُتْ وَهُوَ كَافِرٌ فَأُولَـٰئِكَ حَبِطَتْ أَعْمَالُهُمْ فِي الدُّنْيَا وَالْآخِرَةِ
[2:217]

Anyone who gives into this plan and turns away from his Deen and dies a disbeliever. Such people all their deeds will be shattered and destroyed on the day of judgment, and such are the losers, they end up in the Hellfire forever.

يَسْأَلُونَكَ عَنِ الشَّهْرِ الْحَرَامِ قِتَالٍ فِيهِ ۖ قُلْ قِتَالٌ فِيهِ كَبِيرٌ ۖ وَصَدٌّ عَن سَبِيلِ اللَّهِ وَكُفْرٌ بِهِ وَالْمَسْجِدِ الْحَرَامِ وَإِخْرَاجُ أَهْلِهِ مِنْهُ أَكْبَرُ عِندَ اللَّهِ ۚ وَالْفِتْنَةُ أَكْبَرُ مِنَ الْقَتْلِ ۗ وَلَا يَزَالُونَ يُقَاتِلُونَكُمْ حَتَّىٰ يَرُدُّوكُمْ عَن دِينِكُمْ إِنِ اسْتَطَاعُوا ۚ وَمَن يَرْتَدِدْ مِنكُمْ عَن دِينِهِ فَيَمُتْ وَهُوَ كَافِرٌ فَأُولَـٰئِكَ حَبِطَتْ أَعْمَالُهُمْ فِي الدُّنْيَا وَالْآخِرَةِ ۖ وَأُولَـٰئِكَ أَصْحَابُ النَّارِ ۖ هُمْ فِيهَا خَالِدُونَ
They ask thee concerning fighting in the Prohibited Month. Say: "Fighting therein is a grave (offence); but graver is it in the sight of Allah to prevent access to the path of Allah, to deny Him, to prevent access to the Sacred Mosque, and drive out its members." Tumult and oppression are worse than slaughter. Nor will they cease fighting you until they turn you back from your faith if they can. And if any of you Turn back from their faith and die in unbelief, their works will bear no fruit in this life and in the Hereafter; they will be companions of the Fire and will abide therein.
[2:217]