There are so many ways to make this a great job for you. Like I said be confident in anything you do, because if youre not then it really doesnt matter what you do after that, they wont like your services.
Keep this in mind, you want to hoover around a minimum of $100-$150 an hour production rate. They will most likely need the church cleaned 3-4 times a year depending on traffic. Sumit the ongoing maintainence program for them as well, what it would be over the course of the year.
If you want to be really sweet give them the protector for free the first visit is they agree to a yearly contract. But show the price you discount. I sweeten the deal by giving free stain removal between cleaning dates, to mostly show we are there for them. Relationship building as I like to think of it more than anything.
Allowing them for you to set up a little brochure area for your business, you can at least pull a few grand from the members over the course of a year, not to mention the referral potential.
But you really have to sell yourself as well. Clean shaven, complete uniform(no jeans), smelling pretty and dammit vacuum before you clean it.
But rememeber be confident, act like you do these estimates all the time.
Good Luck.