Well, that tears it...questions about the past, verification of old bones, history...herstory!
The human is a being dogged by the question: Why!
From birth that one word "Why" is only eclipsed by the word "Ouch".
"Mommy, why is the stove hot!" Because it IS says, Mom. "Ouch", says the child.
Sometimes "Because" isn't the right answer. What you've seen and done are the truest realities for you. When you can't, or won't personally experience something, you seek out your answers by observing other and asking "Why".
Standing number three in line to jump off a bridge will provide the answer as to "why" some people are followers. If by the time number two has jumped and fallen 200 feet into the gorge, you haven't figured out this is a bad thing...there's no hope for you. Natural selection of the fittest wins!
But, if the question is "Why" believe in any religion, or a Christ, or the box of bones belonging to this person or that...it comes down to Faith. And, Faith is a natural outgrowth of Trust.
The little child that asked about the stove being hot, who trusted Mom's word and accepted "because" as the final word...probably didn't touch the stove to make sure. Mom's word was enough and, would remain so until such a time as Mom's answers don't jive with personal experiences or, can't compete with the child's desires.
When I came back from overseas, my family was up at the lake house. I hadn't been there in several years so I walked the neighborhood and came upon a vision of loveliness that knocked me off my feet. There was the usual small talk, the question would you like to go to a movie and the welcomed response of, "well yes I would" Bingo! Life was good! As I entered the house, Mom was in the kitchen and asked why I appeared so happy. As I explained about my upcoming date, Mom's eyes began to darken and she said, "That girl is common and I don't want you to go out with her!" I'm here to tell you that "because" didn't work, even from Mom. My trust in Mom on many things was overcome by my faith in my own judgment. It WAS a great date!
Whether you believe in any God, Jesus Christ, or that the bones in the Cathedral at Santiago are indeed those of St James and your belief is not based on Faith, then it's down to "because". God love you if you can generate that kind of trust without asking the question "Why"!
Buen Camino,
Arn