Expel all muslims and close the borders so no more go in.
Make it known worldwide that the we will utterly completely destroy Mecca if this does not end. And it will not, it will only get worse. We ended WW2 with the destruction of Hiroshima and Nagasaki, its due time to do it again.
I can live with the memory that we may destroy a religious shrine but if it is a bargaining chip in our favor then so be it, war is hell.