The problem is that then you'll need to have the agnostics collar to desecrate if we keep pumping them.
I think we're already there, for most intents and purposes, when we talk about Mystera or Glowing Guardian. It is rare anyone can afford their penalties.
I think Binlor is on the weak side currently, mostly because there are many characters that can ignore his penalty. Dracul, on the other hand, is about right.
I'm really interested in the Pactmaker, and they really need to improve on his pacts. (-1% damage per spell, what a scam!!!!!!).
The problem is that if Pactmaker is to stay the same way he currently is, then Taurog, Binlor, Tikki Tooki and Earthmother need complete overhauls and Mystera needs substantial revision. Right now, he has no purpose along-side the piety farm gods who already have more piety than you could possibly need.
Can you desecrate the Pactmaker?
Nope, though honestly the Warrior pact (+4 piety, -1 max hit points) is way better than desecrating Dracul's alter in most cases, so I don't see a need for a desecration effect (it'd basically just be a 7th pact with a 1-time effect rather than something that triggers repeatedly)