It also depends on how you define “Faithful”. There are many people in the Republic, I believe, who believe in your God, but in ways that would be heretical in the Empire.
Just to name some examples, some Circles believe that slave-holding is a sin, as God has created no human above another. Some believe that holding slaves is a holy duty to some, but that the institute of hereditary Holders as practiced in Amarr Empire is a corruption of the original idea and in itself unholy. Some believe that God controls Fate and Voluvals are Signs from God and only Minmatar can truly be God’s. Some believe that God is entirely separate from the secular world and should only be worshiped in quiet contemplation, and that any churches in his name are an aberration.
A lot - most? - of ‘faithful’ congregations of former slaves reject the idea of Amarr as a special Empire and Amarrians as chosen people, while they still believe that God exists and is the ultimate authority on the world and worship in their own ways.
Are these people ‘faithful’? Some of them call themselves so, certainly. Still Abel Jarek’s attempt to bring them to ‘Blessed Servitude’ and ‘back to the Holy Empire of God’ met objection from many of them, too. Jarek was an extremist - not your typical faithful. In his time of preaching in the Eyniletti refugee camps he gained maybe 100 followers, total.
And then, obviously, we have the even larger numbers of people who count the Amarrian God as a god among others - the Amarr people’s spirit, equal to the Seven [translator: gods [Minmatar plural form of ‘God’], spirits, essence], but not above them. And still those who acknowledge the God as the ruler of [translator: literally “what is”, universe, existence, the material world], but hold that we can escape him as other paths exist beyond.
How far can you stray from the Amarr religion that holds that the Amarr throne is holy and not to be questioned, and the Amarr people the chosen people of God, before you are not ‘faithful’ anymore? Who gets to decide who is faithful and who is not? Can any of the above beliefs be taught on your station?