As a scientist, you must NOT allow your biases or any human to tell you what is Sanatan Dharma. You must apply above definition to filter..
Sanatan = timeless, spaceless, situationless.
Dharma = Natural, Intuitive to Adopt..
Can rituals be done by everyone anytime? No
Can rituals be done in Arctic Circle? No
Can rituals be done u r in midst of Tsunami? No
Since, one counter example suffices to reject hypothesis, Rituals are NOT Sanatan Dharma.
Let us dig further.
Are rituals natural for every human to adopt intuitively? No
Can u intuitively decide which ritual is right and which is wrong? No
Hence rituals are not Dharma.
Thus Rituals are neither Sanatan neither Dharma..
But does that mean rituals are useless? ...
Assume this love is Sanatan Dharma, for now..
You may intuitively interrupt me - Hell No. How can a Nokia Phone or an App be Sanatan Dharma?
Well, you are right. The Phone or Whatsapp is NOT Sanatan Dharma. But the love behind it is Sanatan Dharma...
The difference is subtle and that is what Marketing guys exploit during festivals with emotional gift ads.
Now this conclusion has interesting Corollaries.
One, Since rituals are not Sanatan, they are bound to vary with time, place.
In Sankrit Lingo, it is called Naisargika or Swabhavik Dharma to differentiate from imposed ritualism.
Hypothesis - Casteism/ Birth based Varna is Sanatan Dharma
Can you observe a person and intuitively label a caste on him? No
Can you verify birth-record claims of anyone for last 400 generations? No
Hence it is NOT Sanatan Dharma.
Claim: Polygamy/ Polyandry is part of Sanatan Dharma
Can u encourage ur sister/ wife/ daughter to practice Polyandry?
Can u celebrate if your father marries another woman?
For me, answer is NO.
So for me, it is not Sanatan Dharma.
Claim: Is it written in Puran/ Mahabharat etc, hence it is Sanatan Dharma?
Can u understand language?
Can u verify this book is really a genuine book?
What if someone assumes some other book as his religious book and wants to adopt those practices?
Hence these books or their teachings are NOT Sanatan Dharma.
Like in previous example, there are ENABLERS of Sanatan Dharma...
But if I find stories of a prophet breaking moon, or threatening hell fire for disbelief, or story of 5 Pandava marrying one woman, I will not consider it Sanatan Dharma.
So question arises. How do we claim Vedas are Sanatan Dharma?..
Here are pointers.
One, Veda itself comes from root Vid that means Jaane or to know intuitively...
Vedas have answer to this as well. They say - Don't believe, derive.
If you can't derive, work through your life with core acceptable intuitive principles. That will suffice and u will get whatever is best for u
Hence, Vedas because of its inherent definition and framework is Sanatan Dharma. Even if u dont read Vedas or Einstein, u r on right track so far u r genuine.
ॐ कृण्वन्तो विश्वमार्यम्
Om Krinvanto Vishwamaaryam!