In the modern day, God causes a second child to come into this world, this time a girl. Like her more famous brother Jesus, she's got divine powers, but isn't sure what her mission in life is, and she's got to figure it out... but it's tricky, especially with the frustrating silence of her divine parent, the devil trying to start up a new religion around her, and a particularly nasty apocalyptic sect of an existing one.
Obviously, with a premise like this, the book might offend some people's sensibilities, even be considered blasphemous. But if you've got an open mind and can accept the premise like the weird stuff you're asked to accept in any other sci-fi or fantasy book... well, you still might be offended, but you can enjoy it a lot more.
I read this long, long ago and it made a big impression on me, and several of the ideas and images stuck with me, all these years, even if much of the specifics of the plot had faded. I remembered at the time really enjoying it. On a much older reread... well, there's still plenty of good here, but it's not as impressive. The simplified story my memory had turned it into over the years between reads was far more appealing, not because simple is better but just because, as written, the main character comes off a lot worse... and not just in a 'she's a character with flaws' way, but in a way that I'm genuinely not sure if the author realizes how awful and/or stupid it makes the character look. And more characters seemed to be caricatures, even though some remain remarkably full of depth (some sadly go back and forth and I wish they'd gotten more time instead of some of the other plot), and some criticisms (both of religion and society) seemed to lack some bite or occasionally were strawmanny.
But it's still got some really cool concepts and arguments, that still are powerful for me, and in a few ways the book seems remarkably prescient. I mean, it got plenty wrong too but there were a couple moments that I could see being more relevant today than when it was written. And I think some of the basic, non-religious message is still good.
It's just not quite as good a work as I remembered it being. Still, if you don't take religious matters super seriously it could be worth a look.