Quote - When the Earth passes through this very strong gravitational field there could be a polar shift.

A polar shift can cause alot of things to happen on earth that would be bad including the slipping of the earths mantle.

Scientist are now seeing the poles slowly shifting, astronauts on the international space station had to go to a safe room recently because ther was a massive flucuation in the earth electromagnetisphere that weakened it, this protects the earth from the full force of the suns radiation. 

Wow, there is just so much wrongness there.

Okay, the rotational poles don't shift, the magnetic poles do.  While this can cause compasses to go wonky as magnetic north becomes magnetic south, and will probably have other EM effects, it's not a huge catastrophe because there's no evidence that magnetic reversals, which have happened thousands of times, are connected to any significant biological or climatological effects, nor is there any evidence that there's one due ANY DAY NOW (tm, patent pending).

"Slipping of the Earth's mantle"?  Yeah, no.  Dreamed up by catastrophist cranks who think continents suddenly go sprinting across the surface of the Earth, probably wrong back in the day given the evidence and even more wrong now as paleogeographic research has pretty much pinned down the movement of the continents, and fragments thereof, for at least the last billion years and, depending on the current state of the art, up to 2 billion years.  No sudden slip-sliding away (note that the time frame includes several galactic orbits).