Sorry ........X might exist.........is not the same as therefore x exists.
So, are you saying that 'spirit' might exist and, therefore, there is the possibility it might not exist?
I'm still puzzled that you would express yourself in the form "
what scientific test is there to prove that say spirit does not exist" if you weren't implying that there may a case for 'spirit' even if you consider the investigation of that to be outwith the scope of science.
We have some excellent fallacy-spotters around right now and be interested in their views as to whether or not "
what scientific test is there to prove that say spirit does not exist" is an example of the NPF.