A picture can say thousand words. How much more can a video say on your church website. Video is a powerful way to communicate your vision and mission as a church. "More than half of online video viewers (57%) share links to the video they find with others, and three in four (75%) say they receive links to watch video that others have sent to them." -Pew Research. This means your videos have the potential reach of 78,000 with one click (based on Facebook's statistics on a church of 800).
Just make sure if you take this innovative step with your church website you do it with excellence. Not only will a video be an asset to your website when done well but it will also hurt your site when done poorly.