Job 1:9

This was the wicked question of Satan concerning that upright man of old, but there are many in the present day concerning whom it might be asked with justice, for they love God after a fashion because He prospers them; but if things went ill with them, they would give up all their boasted faith in God.

If they can clearly see that since the time of their supposed conversion the world has gone prosperously with them, then they will love God in their poor carnal way; but if they endure adversity, they rebel against the Lord.