Friendship with unbelieversis considered even as a sign of disbelief
وَلَوْ كَانُوا يُؤْمِنُونَ بِاللَّهِ وَالنَّبِيِّ وَمَا أُنزِلَ إِلَيْهِ مَا اتَّخَذُوهُمْ أَوْلِيَاءَ وَلَٰكِنَّ كَثِيرًا مِّنْهُمْ فَاسِقُونَ
“And had they believed in God and the Prophet (S) and what was revealed to him, they would not have taken them (the unbelievers) for friends, but most of them are transgressors.” (5:81)
لَّا تَجِدُ قَوْمًا يُؤْمِنُونَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ يُوَادُّونَ مَنْ حَادَّ اللَّهَ وَرَسُولَهُ وَلَوْ كَانُوا آبَاءَهُمْ أَوْ أَبْنَاءَهُمْ أَوْ إِخْوَانَهُمْ أَوْ عَشِيرَتَهُمْ
“You shall not find a people who believe in Allah and the Last Day befriending those who act in opposition to Allah and His Apostle, even though they were their [own] fathers, or their sons, or their brothers, or their kinsfolk.” (58:22)
In theseQur’anic verses the basic guide‑lines of an Islamic government's external policy in relation to the countries having no faith in God is clearly and explicitly laid down. Muslimsare categorically commanded to guard and defend their independence and freedom, and not let the unbelievers to infiltrate and interfere in their internal affairs.
Muslimsare asked to be on guard against them. All relations andpacts which would ultimately lead to the increasing influence and domination of unbelievers over the affairs of Muslims are illegitimate and must be abstained from. TheQur’anic injunction in this regard is not only clear but also categorical:
...وَلَن يَجْعَلَ اللَّهُ لِلْكَافِرِينَ عَلَى الْمُؤْمِنِينَ سَبِيلًا
“... And Allah will by no means give the unbelievers a way against the believer‑s [to dominate them].” (4:141)