Skepticism is not necessarily hostility or closed-mindedness. It is by definition an introduction of doubt (not denial, but doubt) in situations where it's lacking -- like religion.
I’m not sure how a productive discussion can happen when both sides pre-judge each other. Skepticism itself is a charged term. /r/ReligionSkepticism and /r/AtheismSkepticism already self-select for audiences - one segment is clearly defending, and another is attacking. A more neutral phrasing would be /r/ReligionChangeMyView. I initially wrote this without opening up the GP's link, but I encourage you to check it out to see if this tracks.
To your point about religion, I’m atheist but have a few very religious friends. Them being religious didn’t sour me on them when we first met, though I’ll likely always disagree with them on that point.