On a church calendar there is an export button but it only allows you to export the current view you have on the website. I wanted to be able to grab all the events for the year and come back later to update. Ideal would be to have the actual feed if they update it out the website on Google Calendar, then my information would always stay updated. For manually updating my personal calendar on my phone, this will suffice. The church calendar is using The Events Calendar by Modern Tribe on their WordPress website and I found the custom parameters for exporting a larger ICS file. That ICS file I would import into a custom Google Calendar.
A support forum shows a method of pulling a live ICAL feed into external calendars and also can be downloaded as an ICS file.