There are a lot of people claiming God to be with them in their endeavors. Some go as far as justifying wars and killings by having God on their side. Does God take sides? Does He not have his own ways? Reading through the old Testament it seems that God takes sides. But only with those who follow in His will and decrees.
So I guess when we are in His will we can with boldness say:"if God is with us, who can be against us". Looking on the teachings of Jesus it seems that His will though is to take ones cross up and loose ones life. Let go off the power-trip so many fall into. Some then justify anything with God on their side. I hear the phrases like:" don’t touch the anointed one"; "God put me in this position, who are you to tell me"; or, "look what God has done for me in the past".
Is God on my side? Do I have favor with God? It is only by the grace of God that I’m alive, and only because of what Jesus did for me and all of us that I can say if God is for me, who can be against me? The uncertainty of the word if puts me back into place. I can only know by taking up my cross and follow the one who knew God, his Father, better than anyone else. Perhaps I can learn something from him, and have that confidence as well. Then even in the worst circumstances I will be able to say;

"If God is for me who can be against me".