Have you considered adding a button next to the 'gallery' buttons above the area you write in, where a user could click a 'Bible' icon and have a popup showing a choice of versions and the Bible book and chapter input fields, that are automatically inserted into the post?
I'm thinking something very similar to the sermon-browser functionality where you can choose to add scriptures to the sermon via dropdown choices.
If not, I'll go ahead and do it myself. Just thought it would be much easier than asking a person to remember shortcodes.
I have already done the same thing with another concept I had, where I wanted a user to be able to input information into a hidden collapsible div. The user clicks a button next to the gallery, and gets a popup box where they input their info. The shortcode is then auto added to the post, just like the gallery does…. It's not really that difficult.