You said,

"Let Him fight the fight for you, and you will be filled with endless victory all the days of your life."

That's just not true.

The Bible promises us trials. They make us grow and become more like Christ.

(James 1:2-4 NIV) Consider it pure joy, my brothers, whenever you face trials of many kinds, {3} because you know that the testing of your faith develops perseverance. {4} Perseverance must finish its work so that you may be mature and complete, not lacking anything.

(1 Peter 1:6-7 NIV) In this you greatly rejoice, though now for a little while you may have had to suffer grief in all kinds of trials. {7} These have come so that your faith--of greater worth than gold, which perishes even though refined by fire--may be proved genuine and may result in praise, glory and honor when Jesus Christ is revealed.

(2 Thessalonians 1:4-6 NIV) Therefore, among God's churches we boast about your perseverance and faith in all the persecutions and trials you are enduring. {5} All this is evidence that God's judgment is right, and as a result you will be counted worthy of the kingdom of God, for which you are suffering. {6} God is just: He will pay back trouble to those who trouble you