The polytheists of Mecca say that the angels are the daughters of Allah, the Jews say that Uzair is the son of Allah and the Christians say that the Messiah is the son of Allah. Hence, they express numerous opinions and beliefs. A principle in belief that is firmly established here, is respecting the beliefs of people. Allah U wants to make clear the standpoint of Islam with respect to what they say, and this is a principle in belief. Every religion has a belief system, so does Islam. So, you do not fight people because of what they believe in. Allah U has given human beings a freedom of choice:

﴾وَلَوْ شَاءَ رَبُّكَ لآمَنَ مَنْ فِي الأَرْضِ كُلُّهُمْ جَمِيعاً أَفَأَنْتَ تُكْرِهُ النَّاسَ حَتَّى يَكُونُوا مُؤْمِنِينَ﴿

“And had your Lord wished, all those who are on earth would have believed. Would you then force people until they become faithful?” [Surah Yunus: 99],

﴾فَذَكِّرْ إِنَّمَا أَنْتَ مُذَكِّرٌ (٢١) لَسْتَ عَلَيْهِمْ بِمُسَيْطِرٍ ﴿

“So admonish—for you are only an admonisher, and not a manager over their affairs.” [Surah Al-Ghashiyah: 21-22].