If godzilla was bitten by a zombie, would he then become undead... and if he was undead how could you kill him

All I know is that a Godzilla zombie would be awesome.

Make a giant axe and cut off his head.

you couldnt

...is that the answer you're looking for?

Push him in a volcano [the only sure way].

take the torch out of the hands of the statue of liberty, if the location is new york, and replace it with a giant sniper rifle.

Get Ultraman to do the job..

Well, if the bombs and rockets and a live volcano didn't kill Godzilla I don't think that being bitten by a zombie would make a difference. He's already unkillable. Maybe it would make his breath worse, though.

Yes, he would be undead. I don't think anyone is immune to zombie bites. As far as killing him, you would have to fashion a giant sickle onto something that swings, like a crane. Then you would have to lure him in between two building and chop off his head.

LOL. I think you have too much time on your hands. But you would treat zombgodzilla the same way. throw a lit dynamite stick down its throat and run like hell.....

Godzilla is mutated Monster. It got mutated by radiation. If a zombie bites it it could be possible the it died eventually because a radioactively mutated body is very weak against bio hazard conditions. Even it did survive It will get ill and will dye soon. There are less chances of it to turn into a an undead monster. OK lets suppose it got changed into a zombie zombies a soft bodied monsters and a lot of literature told that we can dismember them easily by a chainsaw or a shot gun. an undead monster could be very easy to kill by separating it to many pieces.

silver plated Mothra

Answer to Q1 - Yes, it'd be undead.
Answer to Q2 - Shoot it in the ar$e!

...I suppose that unusual, unconventional, revolutionary and visionary cross-genre ideas like this, are probably what keep you up, late at night, huh??

...all power to ya', my fellow dreamer!!!

To answer you question - NO. The zombie will have no effect on Godzilla. He is made of radioactive material and the zombie probably melt away if it tries to bite Godzilla.

So the second part of your question is redundant.
Godzilla rules!!!!