Even more security advice: https://observatory.mozilla.org/analyze.html?host=www.newtonlifechurch.org F-Status and recommendations.

Issue here: http://www.dnsinspect.com/newtonlifechurch.org/10147201
Stealth name server, Wrong certificate installed.
The domain name does not match the certificate common name or SAN, RapidSSL SHA256 CA intermediate cert.

See load time issues: https://performance.sucuri.net/domain/newtonlifechurch.org

polonus