Hmm... Well, you can help Brother Burkel open a chantry in Orzammar.
If you're a HN, you can have a small discussion of religion with Mother Mallol in Castle Cousland, so there's a chance to go very pro-chantry.
If you're a mage, you can pray with that crazy girl in the tower's chantry.
Grab various blessings (Ostagar, Lothering, etc.).
Donate to the chantry in Lothering.
You have the choice to make via Mother Hannah's "holy" amulets in Redcliffe. You can either convince her to lie and tell the knights that the amulets offer the Maker's real protection, or you can agree with her and tell the knights no. Hard to say which is more pro-chantry.
Definitely go pro-Templar, which means you have to kill Connor, as the chantry wouldn't support blood magic, even though I think Isolde has it coming.
Don't destroy the Urn and share Andraste's Ashes with the world. Make sure to kill "Andraste" the dragon.
That's all I can think of at the moment. I've never done a Chantry zealot before. The most I've ever done is just a regular person with some measure of faith. Any more than that, and I think I'd choke (due to my extremely religious upbringing and having similar stuff force-fed to me for entirely too long). 