If someone sets a fine example then of course it may spark curiosity in some and if they feel comfortable enough to ask about their fine example and it's sources. Then by all means ask, that is what makes communication and conversation between two people excellent. The ability to learn, understand, and share.
Whereas a public shouting of everyone saying verses at the top of their voice on public transportation, well that just singles others out. If there is one thing, I cannot stand more than others it's having to listen to others religion being spewed in buses, businesses, and basically in public places. I am also agnostic. I will not say Tawheed with others, or after the mention of a name publicly say sayings to show I am a believer of their faith. It just segregates and separates.