So I ended up resetting permalinks and then removing the index.html file from the root, thus allowing the index.php to tell WP to load the themes. All is working now. Thanks for anyone who stopped by!
Additional information:
A friend advised me to reset permalinks to default. I reset them, and when now when I navigate to a sub page, instead of displaying the CFN error message, the page appears as blank white.
Could this be because I have a blank index.html file in the root directory of the server, in addition to having the index.php that tells WP to load the themes?