I find your topic/key word list is not complete enough so I can find my topic on the list. 
Bible.org Response: We are going to implement community tagging of our articles which allows logged in users to tag articles with topics/key words. All of our articles have some topic/key word tag(s), but maybe we were too seminarian when we tagged the article and assigned it to the topic harmartiology and forgot to also add the topic sin!  So, you can help us out and add that tag for us.