The pastor is a certain Steven Anderson from Faithful Word Baptist Church, already notorious for comments on Him that Pisseth Against the Wall. Now he is attempting to prove that there are 666 verses in the New International Version of Mark's Gospel with a view to demonstrating that everyone should be using the King James Version (I understand that this phenomenon is called "KJV only" and it is surprisingly widespread, especially here in the US).
Michael makes some excellent points on PaleoBabble, all of which will be transparent good sense to any one with an education, but I'd like to add a quick point of my own which undermines the bizarre case on its own terms, and it goes as follows: There are not 666 verses in the NIV of Mark's Gospel. Like most modern translations, the NIV does not print Mark 7.16, 9.44, 9.46, 11.26 and 15.28. So there are not 666 verses in the NIV of Mark 1.1-16.8. There are 661. The preacher in question has made the mistake of counting simply by going to the last verse of each chapter and adding up those numbers. Of course he might say that these missing verses are printed as footnotes in the NIV, but then the whole point of his sermon is that the NIV ignores Mark 16.9-20 by treating them as footnotes, so that is hardly going to wash. Hoist by his own petard, I am afraid.