Google is constantly changing its search algorithm for a better experience for everyone. Right now, the big push is for mobile search to improve as they just recently had more mobile search than desktop search for the first time ever. So, if your website is not mobile-friendly, expect to have SIGNIFICANTLY less traffic soon. And the traffic you do get, expect your viewers to be mad about the terrible experience.
Nothing says don’t come to our church like a terrible website you visit before determining where to go.