yes, I know, so again I ask why you think someone would recognize you as a Christian by your behavior if you don't tell people your faith? Behaving well, kindly and moral to others is not exclusive to Christians, but it's a common misstatement/misconception.Being kind to others, respecting others, and helping others isn't reserved for Christians.
I don't like the to use morality. It means something different to everyone. I'm not moral to some people.
An atheist or agnostic can be a better person than a person of faith in whatever way you measure that. Not every friend of mine is a Christian or lives as I would. I'm old enough to decide how I want to live and how I want to impact another person. My heathen (joking here) friends can be kinder, more generous, or helpful than I am at times.