As Phil Johnson once posted,
I often ask Arminians, 'Why do you even pray for the lost? Your theology tells you God has already done everything He could possibly do to save them and now its all up to them. So why do you pray for your lost relatives? Something in you knows that God is sovereign over their hearts'."
Johnson is right. As we read through the Scripture, it is clear we are to pray for the lost. Paul prays for his fellow unbelieving Jews, "Brothers, my heart’s desire and prayer to God for them is that they may be saved." (Romans 10:1)
But the Arminian almost always asks,
"Why do YOU pray for the lost if GOD already choose to save them or not."