This is interesting.
http://fivethirtyeight.com/features/when-does-praying-in-public-make-others-uncomfortable/
what about silently praying, without asking anyone to join in?
“I’ll pray for you,” Silverman hears, “You’re different from me and I’ll pray for you to change.
to be clear, that is never what I mean, when I say “I’ll pray for you”. When I pray for someone, pray for the help they need with whatever problem they are dealing with, or wisdom to deal with said problem. I normally reserve the “I’ll pray for you” comment, for when someone tells me they are facing serious difficulty or something like that.
I believe Christians are required to behave with decent conventionality out in general public spaces for regular day-to-day affairs. They shouldn’t make a spectacle of themselves or be disruptive. It isn’t difficult to pray without doing what is likely to draw attention.
Home or specifically Christian gatherings are the place for display.
If atheists engage in a discussions involving religion they shouldn’t get their noses out of joint at an “I’ll pray for you”.
Missionary or evangelical work for those who honestly feel called can be tricky. They should make their points and shake the dust from their feet if they don’t get a positive response. Precious things shouldn’t be subject to hard sell.