This is only obvious to those who know via the experience of enlightenment. Belief gets you nowhere here. In fact, it's an active hindrance to the truth of the matter. You cannot fight the ego and win. You cannot make a believer see, if that's all they have. The church is a scam, but not in the way anyone can explain. It's just words.
“We’re all God in disguise. Jesus found that out, and they crucified him for saying so.”
— Alan Watts 
Discussion
Well said.
How is claiming enlightenment different than belief?
First-hand experience is a kind of knowing. Belief is a sincere hoping.
But experiences are subjective and can deviate from reality, like dreams, there must be some tie to reality, ie. a shared experience with unbelievers/unenlightened that could serve as proof?
There is a difference between believing something because it has been told to you, versus feeling it viscerally in your heart.
This feeling is what many who sit in meditation, travel to mountaintops, or take psychedelics seek.
There must be distinguishable evidence of this knowledge/belief in reality. Many people have genuine belief/perceived knowledge in falsehoods, and their strength of belief/understanding does not produce truth in reality. Wouldn’t that which is true have miracles associated with it?
Experiential wisdom