1 you (and I, and most scientists) accept that DM is the best explanation for the gravitational effects observed in galaxies. (Agree? yes) .....
No.
This has been explained to you several times by several people. Did you even read those posts?
"Dark matter" is not an explanation. It's rather the label used to refer to an unexplained phenomenon.
It's the label used to refer to whatever it is that accounts for the excess gravity that is observable and measureable.
We don't know where the gravity comes from. We call this unknown stuff "dark matter".
2 if anyone disagrees on that DM is the best explanation, he is expected to provide an alternative, and show that thus alternative is better (Agree yes)....
It's not an explanation. It's the label given to whatever it is that accounts for the excess gravity that is being observed.
We don't know what it is. What we do know is that there are gravitational forces that can't be accounted for by the matter / mass we observe (see).
So we need an explanation for where that excess gravity comes from. We call that unknown thing "dark matter" - but we do not know what it is.
So it's not an explanation. It's rather the name of an unknown, of a problem yet to be solved.
3 if you disagree on that God is the best explanation for the origin of the universe..... Why shouldn't you be expected to provide an alternative?
Because we don't need "alternatives" to things that aren't even explanations to begin with.
It's not that I think that god is not the "best" explanation. It's rather that I don't even consider it an explanation, full stop.
Why making an arbitrary exception with god hypothesis? This is special pleading
It's not arbitrary at all. There is no "god hypothesis". There is nothing there but bare claims. There are no testable predictions, there are no facts to argue from, there are no tests that can be conducted, there is zero verifiability, there is zero falsifiability,... there is nothing there.
This false dichotomy between science and theism is nonsense.
The claim is that science (and logic) supports the conclusion the universe was caused by a timeless spaceless inmaterial , personal , inteligent etc... agent that we happen to call God........
It does not and it has been explained to you countless times in this thread why it does not.
As usual it's in one ear and out the other.
Note that you are not being asked to expose all the flaws in my hypothesis, you are being asked to provide an alternative and to support it
There is no need to.
We don't require "alternatives" to point out absurdities in claims.
When you are trying to solve a murder case and come up with a claim that uses false premises or otherwise engages in fallacious argumentation or misrepresentation of facts, we can absolutely dismiss those claims without having an "alternative".
We don't need alternatives to nonsense.