We live in a cause and effect universe.
How we describe reality accurately we call "true."
Contradiction with reality we call "false."
Once we describe a phenomenon accurately we cannot then violate the accuracy by further declaring a contradiction.
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Either death is the cessation of Life or it has no meaning.
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For something to be understood by us (as science is used for understanding), we must be able to verify, test and measure it.
Life after death is not only a contradiction of the definition of "death," but an immeasurable assertion beyond testing.
The logical conclusion is what?
There is a wall between the actual, physical universe of laws and cause and effect and the imaginary world of METAPHYSICS.
METAPHYSICS asserts a different universe where pigs fly and deuces are wild.
These are non-overlapping jurisdictions or magesteria.
Logic requires a thing to be what it IS and never what it is NOT.
If you embrace both worlds, PHYSICAL and METAPHYSICAL the result is this: you destroy your rational means of testing TRUE and FALSE
and you become deliberately irrational.
Choose carefully while you are in the PHYSICAL universe BECAUSE those laws are operative!