// Your churchonline.org url
var churchUrl = "http://live.ourchurch.com"
If you change that to https: it won't load at all. However, the Church online platform URL does have an SSL certificate. Change this to:
var churchUrl = "https://ourchurch.churchonline.org"
This will allow the widget to load over SSL. Note: When I copied the URL it had a / at the end of it which broke the script. Make sure there isn't a slash at the end of the URL.