Well friend, i have already answered your first question, but i will answer it again if you say so. Will there be any ground left for christianity when Hazrat Isa (A.S) himself will be following Islam?? Its common sense dude.. use some common sense and you will get the answer !!
Well Allama’s view point does have alot of value in my eyes.. i dont care about anyone else if he has value for his view point or not, but atleast in my view point his ideas have alot of value.
And by the way, yes Allama was not a Mufti.. But how many muftis have called your relegion wrong?? would you listen to them?