They refuse to "donate" do they? Meaning they will not gift "something
voluntarily and without compensation". Your church has a problem with this
and now wants to force them to donate to you?

That's not called a donation anymore, it's coercion.

If you win this, will you then campaign against every individual or company
who refuses you at annual doorknocks and other collection events. Let people
have a preference, if they don't want to give money to 'churches' that
actively coerce donations, then let them. Always wondered what you lot got
up to when a decent crusade wasn't available.

Personally, I would be more interested in why they stopped donating - you
don't seem to have mentioned that.