Just a shower thought, probably nothing, but someone may find it interesting.
You proclaim your faith by choosing a particular version of Bitcoin Core to run. Through that choice you tell the world what you believe Bitcoin to be.
Now, you could modify the code to do something else, for example increase the block subsidy back to 50 BTC and start granting that to yourself, or increase the block size. However, other "believers" would just be like "nah bro, I don't believe it that", ignore you and move on with their lives.
But no one would stop you from continuing to run that software and continue to believe it to be the "better" Bitcoin. You might even convince other people to do the same thing, forming a "sect".
Still, most people continue to believe in "mainstream Bitcoin".