Why? Why should we ask God to be merciful in His judgment? What gives us the right to pray on Saddam’s behalf, assuming you beleive that he did what he did. Spend time praying for those he murdered if you want.
Since you come from a different belief system you likely don’t understand where we are coming from. We believe that God desires the salvation of all men (1 Tim 2:4). So, we want what God wants. However, above all else, God allows each of us free will; He is not going to force Himself on anyone. As a result, not all men will be saved due to their own refusal to repent of their sins (and, in our belief system have faith in and be baptized in the name of Jesus Christ). We are not praying that Saddam get a free ticket into heaven. Rather, we pray that he will come to repent his sins before his death, that God will know he has repented in his heart, and that God will grant him mercy because of the repentence. God is merciful, but He is also just. In the end, everyone will be exactly where they deserve to be. In my view, Saddam is an enemy of humankind, disgusting and repulsive. But as a Christian I am compelled to follow these words of Jesus from Luke 6:27-36:
27: "But I say to you that hear, Love your enemies, do good to those who hate you,
28: bless those who curse you,* pray for those who abuse you*.
29: To him who strikes you on the cheek, offer the other also; and from him who takes away your coat do not withhold even your shirt.
30: Give to every one who begs from you; and of him who takes away your goods do not ask them again.
31: And as you wish that men would do to you, do so to them.
32: "If you love those who love you, what credit is that to you? For even sinners love those who love them.
33: And if you do good to those who do good to you, what credit is that to you? For even sinners do the same.
34: And if you lend to those from whom you hope to receive, what credit is that to you? Even sinners lend to sinners, to receive as much again.
35: But love your enemies, and do good, and lend, expecting nothing in return; and your reward will be great, and you will be sons of the Most High; for he is kind to the ungrateful and the selfish.
36: Be merciful, even as your Father is merciful.
Tough words to follow sometimes. But as Christians we must.
By the way, if one prays that Saddam will repent and God will be merciful to him, it absolutely does not mean that we aren’t praying for those who died at his hands. One prayer doesn’t preclude the other.