Islamic Perspective:

O you who believe! Take not My enemies and your enemies (i.e. disbelievers and polytheists, etc.) as friends, showing affection towards them, while they have disbelieved in what has come to you of the truth (i.e. Islâmic Monotheism, this Qur'ân, and Muhammad SAW), and have driven out the Messenger (Muhammad SAW) and yourselves (from your homeland) because you believe in Allâh your Lord! If you have come forth to strive in My Cause and to seek My Good Pleasure, (then take not these disbelievers and polytheists, etc., as your friends). You show friendship to them in secret, while I am All-Aware of what you conceal and what you reveal. And whosoever of you (Muslims) does that, then indeed he has gone (far) astray, (away) from the Straight Path. (Al-Mumtahinah 60:1)

O you who believe! Take not the Jews and the Christians as Auliyâ' (friends, protectors, helpers, etc.), they are but Auliyâ' to one another. And if any amongst you takes them as Auliyâ', then surely he is one of them. Verily, Allâh guides not those people who are the Zâlimûn (polytheists and wrong­doers and unjust). (Al-Ma'idah 5:51)

O you who believe! Take not for Auliyâ' (supporters and helpers) your fathers and your brothers if they prefer disbelief to Belief. And whoever of you does so, then he is one of the Zâlimûn (wrong-doers, etc.). (At-Tawbah 9:23)