Maybe I can give you some insight. Others might be able to speak to the subject also.
First, let me tell you about a group that did not work. We met at a set time at a local coffee shop (back room). The organizer and leader had no agenda. His idea was to gather and "talk shop."
Second, I will share some notes about the group I currently belong to, it has been in existence for several years. We too talk a lot about writing; however each member is responsible for the program on a given month. Members present everything from research papers to scenes from novels they are working upon. Note our community is about 40K in population, and our group is about 20 folks. We meet for dinner at a country club one night per month. There are no dues, but we each $15 for dinner, tip, and share of room cost. We help with the Arts Council's annual literary symposium.
Both groups are/were secular in nature, but occupied by Christian men and women.
I have also been on the organizational end of two church based Christian groups; neither went well; one person told me it was just one more meeting at church she had to go to.
"Here I am Lord, send me."