witnessing

We Christians seem to think, for some reason, that if we dress a certain way, if we talk a certain way, and if we wear a cross, and carry a bible, that we are witnessing to the unsaved. My question today is: Is that enough? So you stop by the side of the road and help that poor guy whose car stalled. You grab something off the top shelve for some old lady. You are friendly to everyone. You don't curse. And you memorize scripture in your spare time. Then you get one to two people in 5 years who come up and say something like.. Cool shirt, or , hey there is something different about you, or something similar. Is this what God has destined us to? We are not merely here to get the most people converted to Christ. But for goodness sake if you don't mention Christ at all then how can you gain even one for the kingdom? So, my point being, even if it is mostly for me, stop thinking that you will gain someone to Christ merely by your actions. Who in the bible did it this way? No one that I can find.