I've written a novella that is about 23K. So far I'm not getting any interest from agents. The moderator of the novella forum suggested I post here to find out if anyone has sold Christian novellas through the traditional publishing route.
She also said there are beta readers who will read your work and comment on it. How does that work?
Many agents are not interested in novellas at all. They are difficult to sell and far less lucrative than novel-length works. So, yes, that will definitely work against you. You may have better luck selling it to a magazine that publishes stories of that length.
Beta readers can be found two ways.
One is to go to the main page of AW and scroll down to "Share Your Work". You can post the opening of your novella in the genre-appropriate subforum (once you've reached 50 posts on Absolute Write). Other writers will critique your opening and give you feedback. You can note in your post that you are looking for beta readers. This is a good way for a reader and writer to 'test the waters' to see whether or not their styles match. You can also critique other people's work there -- a good way to get to 50 posts in a hurry!
The other is to go to the main page of AW and scroll down to "Beta Readers, Mentors, and Writing Buddies". There you can offer a short blurb about your story, and maybe the first hundred words or so, and ask for beta readers. However, it's unusual for a new member to attract many betas, as most beta readers do want to know who they are offereing to beta-read for. Members who have been active on the board and who have shown they are willing to help other people are more likely to get people offering to help them in return.