Highly unlikely. The number of children worldwide Under the Age of Accountability alone is near two billion. I refuse to put limitations on God. And that is what saying he would only save children UAA that are children of christians does and this seems along those lines too. Just becuase the have been paralls on some issue in the past doesn't mean all issues have paraells and that it he save 144,000 jews from the tribulation he must only save 144,000 christians from it too.
 
Paul