When people say they are believers, they are tested.
This is God's immutable law: God subjects believers to all kinds of tests in this world.
Sometimes, God tests believers by giving. And sometimes he tests them by not giving or by taking away from them what he may have already given them.
God says he does that to separate the wheat from the chaff.
And to differentiate between those who are Real and True Believers and those who are sham; those who are faking belief; and those who are making false and convenient claims.
And those who want to have it both ways.
Those who may want to play it "safe."