If your church has a favorite translation of the Bible you could use some basic number sequences. Find each word from your message in some bible text. Represent the word as a sequence of 3 numbers-
Book of the Bible number (or page number but these could be different)
Chapter number (or paragraph number on page)
Word number (depends on the same version being used)
If I want the word BEGINNING, I could use Genesis 1:1. It would encode as 1,1,3
The word ONLY from John 3:16 (in the NIV) would be 43,3,314
You can use your word processor to do the word count.