I really doubt George Bush said anything about Gog and Magog and I'll explain why.
First, Bush is a Methodist, and they don't do prophecy. The position of most Methodists on end times prophecy is amillennial, which means they reject the idea of prophecy literally coming true. The Methodist position on the Rapture (the touchstone of every wacky end times Christian) is this,
quoted from their website:
[We] have no doubts that many pastors and churches are tuning in to this speculative phenomenon. However, it is not central to our approach to discipleship and our theological framework. Wesley and his spiritual children are not into the future in the kind of rapture/left behind approach.
Speculative phenomenon? Doesn't sound like they buy into it. So if Bush believes in end times prophecy, he's not hearing it at church.
Second, Bush has spoken often and openly about his faith, and not once that I can find has he ever mentioned Bible prophecy in any context. He has on multiple occasions, however, stated that he believes that Christians and Muslim worship the same God and that Islam is a religion of peace. Those are not things you're likely to hear an end times Christian say, so if he does believe in end times prophecy, he holds some other, rather startling, positions.
Last, the only quote we find purported to be from Bush on end times prophecy is the one already posted here, which he allegedly said to France's Chirac before the war in Iraq, and it's surely made up. The book it came from, a bio of Bush, has been called inept, and "based on unreliable accounts, factual errors, and wildly implausible judgments." About the alleged God-Magog quote,
the author of one rebuttal says:
The conversation is utterly and completely false. Bush never said these words to Chirac or anything of the sort to any other world leader. I have checked with multiple senior people with firsthand knowledge of the call Bush had with Chirac, and all confirmed that Bush never said anything remotely resembling those words.
Knowing what we know about the Methodist church's view of the end times, and what we've heard Bush say publicly about his faith and about Islam, does it make sense that he would say something like that about prophecy?
I will say again, there is no major school of evangelical prophetic thought that views Armageddon as something to be desired. This is a straw man assumed by those ignorant of what believers in end times prophecy actually believe.