There's some margin between what we know and what is possible. For example if you want to think the universe is 13.6 billion years old, you're in luck that's within the margin of error for the last WMAP readings. If your religion says that the universe works by loop quantum gravity, you're in luck it very well might. If your religion says the universe is 6,000 years old, you're just wrong. That's well outside the margin of error.