Now, that’s Jewish(?)

Why isn’t Judaism the most ancient of all religions if it is the correct
one or is it the most ancient just wasn’t officially considered a religion?

Because people had plenty of time to make up religions before Matan Torah.

How come idolatrous religions are still alive and strong even in this age of understanding?

Age of scientific understanding, I assume? If you don’t make any claim
that can be proven or disproven by science, science is irrelevant.
(Science has nothing to say about right and wrong, for example.)

Obviously there are many instances where modern medicine is not fit
to cure and more homeopathic and herbal remedies are necessary and can fix.

Homeopathy has been thoroughly demonstrated to be based on nothing and doing nothing. (According to Wikipedia, “Although the treatments themselves had no effect, they were far safer than most medical practices at the time [late 18th-19th centuries]. The outcome from no treatment and adequate rest was usually superior to mainstream medicine as practiced at the time of homeopathy’s inception.” So there’s that.)

Wouldn’t it be strange if Judaism doesn’t have those
essential secrets but having to rely on other religious wisdom?

lot of times it’s intertwined and difficult to separate the wisdom from the religion aspect

One of your examples was medicine, a field we are told
that Chizkiyahu haMelech took away our knowledge of,
and your later comment about the difficulty of separating
religion and wisdom tells me you mostly mean Eastern stuff.
I’m going to assume that in that category, if we don’t have it,
it’s either not wisdom at all or it’s not essential for us to have.

If you have a really long post with nothing too controversial in it,
you can split it up into multiple posts. (Years back, I think I used
to make a copy of every post I submitted and then delete it once
it had been approved, but that’s kind of a hassle.)