Do it for that one person who believes in you.
There might be several who don’t believe in you.
Do it for that one person. Even if he is just one.
The believer deserves your action towards his belief.
For the non believers the world will not change if you stopped because of them.
But if you drop what believer expected from you, you will add one more non-believer to this world.
The world needs more believers.