Like Job came to say, "Though He slay me, yet will I trust in Him.". What greater testimony to the lost than for a believer to get to that level of spiritual maturity! The lost world looks at suffering Christians and, like Job's unfaithful friends, say, "Why don't you just curse God and die!?". They marvel that we can still praise God even in the midst of suffering, but that is one of the purposes of the stuff He allows into ours lives - that ONLY a genuine faith in a genuine God can carry someone through it. It proves that there is a there there! It cannot be faked.
Job 19:25-27 For I know that my Redeemer lives, and at the last he will stand upon the earth. And after my skin has been thus destroyed, yet in my flesh I shall see God, whom I shall see for myself, and my eyes shall behold, and not another.