Couldn't agree more. If the situation is as reads, OP is being set up as a scapegoat. Maybe not maliciously, but it stinks of last ditched efforts to avoid personal failure by the higher ups.

I wouldn't take this job and I absolutely love a challenge.

You don't send a first time manager to save a failing project at the last minute. You'd send an experienced one and use the first timer to fill in gaps on easier projects if needs be.

I really hope you rethink this OP, there's lots of good comments here.

Again, there might be more to the story so insert disclaimers here.