Al-ʿAllāmah Abū al-Thanāʾ ibn ʿAbdullāh al-Alūsī (d. 1270 AH) said:

Indeed, the Christians are an illiterate nation; a coalition based in ignorance. They have completely submitted to blind imitation [of their leaders], utterly refraining from the path of rightly guided truth. To the extent that they do not show due vigilance in ascertainment of the truth regarding what they have received from their religious leaders. Nor do their religious heads and heretics even contemplate what their very religion is based upon. For if they had, the religion of Christianity itself would cease to exist due to its evident corruption. Is it not enough for you that they are a people who actually believe that their God created his own mother. Then, his mother gave birth to her own creator?!

From among the evidence of their mindlessness is what has been narrated by al-Masīḥī in his ‘Tārīkh’ that their leaders gathered up to ten times in Constantinople and Scandinavia in order to decide upon the creed of their own religion. After concluding that a particular ideology was correct, they would perpetually reject it after a period of time had elapsed. Then, they would label those who believed in it a disbeliever while adopting another ideology in its stead. This is because they follow the whisperings of their religious leaders; not the revelations of their Lord.

Source: Al-Ajwibah al-Fākhirah: 53-54
Translated by: Riyāḍ al-Kanadī