JUST BECAUSE YOU BELIEVE SOMETHING, doesn’t mean that it’s true. Just because someone told you something is true, doesn’t mean that you need to believe it. Just because you’ve always believed something, doesn’t mean you must continue to believe it. Just because everyone in your family believes something, doesn’t mean that you need to believe it. Just because people have believed something for thousands of years, doesn’t mean that you need to believe it too. Just because you really want to believe something, doesn’t mean that you should believe it. Nor, actually, does it mean that you shouldn’t believe it.
What all of this means is that it’s a good idea to know what you believe, and why you believe it, and make a conscious choice about all of it.