For those who don’t expect they’d participate in a FB (FaceBook) type of discussion format, perhaps the following two forums would be of interest:
Christian Universalists have been posting there for years, including some members of this site. I’ve seen them in these topics:
“Controversial Christian Theology
Nicene and Non-Nicene Christians only
(eg. full preterism, universalism).”
christianforums.com/forums/ … ology.130/
city-data.com/forum/christianity/
Another forum is at Tentmaker, though i don’t know if they’re accepting new members at this time.
These are all excellent options to find Christians (& others) who will attack you for what you believe ;