Sometimes we are faced with situations where our belief will make another uncomfortable. We must not concede to their being uncomfortable with our faith. There are ways to show you are a Christian, without standing on a corner with a megaphone in your hands shouting Bible verses.
Rejoice in your Lord, but be a shinning example of how Jesus came to us without an Army, and saved us all from the tyranny that is evil.
I saw a sign in front of a church the other day that read like this: One candle that lights another, does not diminish its self. Powerful words. We can be a light, we can be an example, and we can help others to be the person that God wants them to be.
We can accomplish all of this, without taking away from who and what we are. We don't have to be a preacher, we don't have to lead people in prayer, we simply need to be who God calls us to be. That will be sufficient.