I think you’re right about language/verbiage.
The description on the first page doesn’t give a tangible/physical description of what its being used for, benefits the community/others and what people donating get out of it. I also don’t know what “offering affirmation” means and if its linked to donation or…?
page 1 “ways to give” button are really a selection of “amount to donate”. They may not like replacing giving with donating.
page 2 Choose your donation amount looks fine. Wish I had suggestions for url - I don’t know why they highlighted it.
page 3 “give now” is really “donate now.” Perhaps without “now” its less sales/more charity?
page 4 I’ve never seen “new” above entering credit card details. And right below it says Credit Card Info - Perhaps get rid of it so its not redundant. I would use something more common like “payment.” And I would make sure your terms/privacy policy for storing credit card information is available.
Great to see you helping your church!