well as you are just a kiddo , this Verse is specifically Talking about those Jews and Christian who did not keep their oath and betray the Prophet when Medina was Siege by Meccans , and Jewish tribes with some Christian Tribes break their Commitments to Prophet and his followers .. and yet, even if you read the Verse, it say not to take them FRIENDS .. those who are Zalimun which derive from Zalim Oppressor , and no one wants to be Friends with such people isn't it true ? ( North Korea , and other brutal Regimes ) for example ..
lets go back to Topic ..