Can You Defend Your Faith

“Defend your faith!" That was a statement I heard many times growing up in church and youth group. But I was thinking about that statement recently and was wondering what that really means. Can I truly defend my faith? I may have heard it growing up in a Christian environment but I don’t think that it is limited to there. I grew up next to a family that was Muslim and as kids playing together we didn’t really know the differences in our faiths until one day we talked about who Jesus was. Even as a 10 yr old we both felt compelled to “defend our faiths” and I tried, to whatever extent a 10yr old could interact with another one on that level, to defend my faith. But the very nature of the word faith implies a belief in something we can not prove. So if we each have our own faiths can we truly defend it? Do you believe you can truly defend your faith, whatever that might be? Even if you are an atheist you to must feel inclined to defend what you believe and since there is no proof that there is no God even someone who believes in nothing believes that by faith. So I ask the questions again hoping someone will tell me. Can you truly defend a belief that has no evidence for existing therefore it is a belief that can come only by faith?