A version of the poisoning the well fallacy. ^^
Argument from authority fallacy. ^^
Anyway, I agree with @mordant and would go one further to illustrate by asking: by what standard do you determine god and the father and the son and the holy spirit to be part of reality, yet disparage the notion that hell is real?
And if the standard is “because god,” what evidence is there that this god exists, or is even possible?