Vlad,
Were that all there was to it rather than it unavoidably being a philosophical position......... working like that would be completely despicable.
That’s exactly what it is, despite the lie you keep telling yourself that it’s something else. Possibly you’ve forgotten your spectacular own goal recently when you linked to a Wiki article that used the exact phrase “working assumption”?
Furthermore…
You can’t have a “furthermore” when your opening effort has collapsed.
…it isn't working scientifically because science does not assume that material is all there is.
Yes it does as a
working assumption because the material is all the methods and tools of science can engage with. Science has nothing to say though to the possibility of one or ten or a bajillion other types of “somethings” that
could be. Trouble is, nor does religion.
To spell it out again assuming that material is all there is is philosophical materialism.
You’re using “spelling out” as a euphemism for “lying” here. At best you might find some extreme versions of logical positivism that head in that direction, though how anyone would eliminate the possibility of unknown unknowns is anyone’s guess. The point though is that – to my knowledge – no-one claims the absolutist position you’re so desperate to paint on them and, even if you could find such a person, that would take you not one jot of one iota of one smidgin towards an argument
for your (or any other) god.
I’ve told you several times now that it’s a bad idea to cling to a mistake just because you’re heavily invested in it. It's good advice - why not take it?