I'm hoping you don't know what "agnostic" means ... I'm sorry if you're under the impression it's an insult. Everyone is either gnostic or agnostic. An agnostic person doesn't feel they know or need to know; whereas a gnostic person does feel they either know or need to know. There are differences, and they are clear ...

No. We are not all agnostic, you are simply identifying yourself honesty and feeling that it must mean it's just human. It isn't. And no, None of it is secret or destroyed. It's just a matter of Knowing, or having beliefs.