Wheat and weeds. Clean fish and unclean. The sorting always takes place at the end of all things, and it is always the Lord or his angels who do the sorting. That means that now, as we speak, believers and unbelievers graze together. They get treated alike.
Believers get the same rain and sunshine as do unbelievers.
They get the same colds and flus, clogged arteries and cancers. They have the same business problems, car problems, and house problems. They both die. And they both rise in the resurrection on the Last Day. But that's where the similarities end and the differences begin.