There has been some debate about "truths", namely Caitlin told Sheldon that his truths are not everybody's truths.
Let's get things straight!

"truth
tro͞oTH/Submit
noun
the quality or state of being true.
"he had to accept the truth of her accusation"
synonyms: veracity, truthfulness, verity, sincerity, candor, honesty; More
that which is true or in accordance with fact or reality.
noun: the truth
"tell me the truth"
synonyms: what actually happened, the case, so; More
a fact or belief that is accepted as true.
plural noun: truths
"the emergence of scientific truths"

Truth is just truth it isn't possessed!

fact
fakt/Submit
noun
a thing that is indisputably the case.
"the most commonly known fact about hedgehogs is that they have fleas"
synonyms: reality, actuality, certainty; More
used in discussing the significance of something that is the case.
noun: the fact that
"the real problem facing them is the fact that their funds are being cut"
a piece of information used as evidence or as part of a report or news article.
synonyms: detail, piece of information, particular, item, specific, element, point, factor, feature, characteristic, ingredient, circumstance, aspect, facet; information
"every fact was double-checked"

Facts are not possessed either. they are just facts cold and hard!

o·pin·ion
əˈpinyən/Submit
noun
a view or judgment formed about something, not necessarily based on fact or knowledge.
"I'm writing to voice my opinion on an issue of great importance"
synonyms: belief, judgment, thought(s), (way of) thinking, mind, (point of) view, viewpoint, outlook, attitude, stance, position, perspective, persuasion, standpoint; More
the beliefs or views of a large number or majority of people about a particular thing.
"the changing climate of opinion"
an estimation of the quality or worth of someone or something.
"I had a higher opinion of myself than I deserved"

The old saying goes that everyone can have an opinion. The problem is that opinions can be wrong and often are. In Caitlin's case, she believes that "sin" is real which is her opinion but it is not fact.
The fact is as Sheldon presented it to her that sin is a concept not proven. Caitlin dismissed that glaring fact with HER opinion.

And that is the case of all religious apologists. They accept THEIR opinion and dismiss fact. They revise history, and facts to fit their opinion and dismiss REAL facts. When presented with the REAL facts, they often respond those are YOUR facts, not mine, as if there alternatives to facts.
It is just one more failed tactic by religious apologists!