Peace all!
I think a support group is great. One thing I can advise is that if you have number of people that you associate with that are not Christians, your best way to handle them is to show them that what they say to you does not offend you at all. If you think about it, they only offends themselves because they are accountable to what they say or do...just like everyone else.
I know sometimes I do get offended inwardly but outwardly, I show them my armor and how they cannot pierce through it.
It's easier said than done but given time, it works....at least for me it does.