Is it allowed to be friends with Christians?

The Quran says: > O you who believe! Do not consider Jews and Christians as your helpers and friends, because they help each other. If any of you consider them your helpers and friends, then he himself is one of them. Indeed, Allah does not guide the wrongdoers. (Surah 5, 51 ayat) I have a Christian friend. Question: am I allowed to be friends with him if he doesn't influence me religiously?