Ummm, wouldn’t you say that God was dispassionate about the bulk of humanity that He would throw into hellfire forever under Reformed theology?
I have no idea about the numbers. Personally, I'm a post-millenialist, and I believe one day the world will be over-run with confident, slap-happy Christians.
But I don't believe God loves everyone, or else that perfect love would make everyone His children and Christ said He will lose none of those whom God has given to Him.
So those who are condemned for their sins are not His children. And those who are acquitted of their sins by Christ are His children. One day you and I will know exactly who makes up those two categories, but today we have only a man's fruit to know him by (keeping in mind that "whatsoever is not of faith is sin.")
But regarding the wheat and the chaff, this is what God has to say...
"...he that hath my word, let him speak my word faithfully. What is the chaff to the wheat? saith the LORD." -- Jeremiah 23:28
As noted before, none of us knows for certain who is chaff and who is wheat, so we are to look after each other and preach the Gospel to all men, confident that God gives ears to hear to all His children.