I've got just the answer you're looking for about using QuickBooks Online in Ontario.
Great news! You can use QuickBooks Online in any regions in Canada.
The application will help track the business’s accounting activities. You can view the company’s data from multiple devices as long as you have an internet connection.
You can sign up for a 30-day free trial or access the sample company to see how QuickBooks Online works. For more information, please visit this link: Choose your QuickBooks plan.
Since you'll be using QBO for a church, I’m adding articles with detailed information on how to use it for a non-profit industry.