Galactus wasn't hungry vs Odin and Odin held him off for a while all by himself. Two Skyfathers Odin's level should be able to beat an average non-hungry Galactus.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
he was only able to hold Galactus when they do mind battle..when Odin really go for physical confrontation..he KO himself..he's no where near Galactus in term of power..
Stop putting verdicts in from one showing (a mind battle only). Look at the entire picture from history.
Galactus >= any average Celestial
an average Celestial > two skyfathers
Based on his showing vs Odin, if he just stands there not defending himself and lets the skyfathers do all the physical damage, then probably 2 will be enough.
Based on his showing VS Galactus Engine, he'd need probably need the entire Council Of Godheads combined to even register as a threat. That cancerverse arc explicitly showed that a fed Galactus is a peer to Arishem and Co.