I do think that believing we need a mediator or redeemer makes God an adversary -- from our perspective. I believe that God has never really been that adversary but like in the case of divorce, God in a sense knew the heart of humanity was hardened. When we find that our true redeemer is Jesus, and that Jesus was the incarnation of God, it is then we realize that God never was our adversary but was always for us. Of course we now have the benefit of historical revelation to look back and understand. I think that faith and humility was and still is the core of our part of salvation for "God resists the proud and gives grace to the humble" (James 4:6). In that verse we find that when we humbly accept the love and realize how forgiving God is through Jesus, we receive the grace to walk in. We are thus saved by grace. We are first loved, then learn to walk in the gift of faith God has given us.
God never was an adversary to me, while God allows things, again, we need to either take responsibility and make sure things like kids dying of starvation in Africa does not happen or realize that just sometimes we need to stand in faith as God is doing something greater than we can understand and know. At times, and maybe this is extra-biblical (Book of Enoch-ish) but at times I wonder if all this is about proving that Satan is worthy of his judgement. That God created mankind to show Satan that a creation can and will love God in their own free will. If Job shows us one thing is that there is hope in humanity when we humbly accept what God is doing. Humanity may not like it or understand it, but imagine if all people humbly began to seek out ways to love others... what would this world look like?