Mrs. BD says that, in the women's prayer and study groups she is involved with, her most useful inspirations lately come from C.S. Lewis' The Great Divorce.
A number of the women in these groups are "searchers," "questioners," etc., and not committed or reborn Christians, but they are bright and curious. It's a good mix of people, it sounds like.
The book seems to focus on the emotional, intellectual, and psychological obstacles and resistances to faith, presented in allegorical form. It's the only CS Lewis that I have not read. It's said to be sort-of a pop version of The Divine Comedy.
What are the obstacles to accepting the offer of a life "in the Kingdom"? One view would be that it is addiction to self, or addiction to the material world, or similar attachments to intellectual vanity and other things - all supported by various rationalizations. The point, if I understand Mrs. BD's exposition, is that the offer of life in abundance in the Kingdom is now, but, just like afterlife (which I am dubious about), you have to leave some baggage behind to get there. It's a free choice to live in the darkness or in the light.
The freedom of choice is important.
Here's an interesting development, about the psychology of non-believers