Whether God exists, or not, the concept or truth of God is that he/she/it tends for the most part to be a separate reality / entity - so our management of suffering and evil is our own responsibility.
To feel Love and all the feel good words associated, we must feel Pain. How could one truely recognise joy if we did not have sadness? Its a benchmark of Life. Suffering is part of our emotional makeup. Evil is ideology, it is ignorance and rejection of anybody elses opinion, and judgements of such kind breed hatred.
God and Satan are reflections of our existence, a reality to mystically - spiritually seek answers. Their reflections have frequently been used to control and organise the Life of the masses. They are signposts for Love and Hate - we gave them names.
Whether God and Satan need not work through us directly or remotely is obviously a varying perspective in the Christian point of view. As this is the case as we are unsure of how they associate with us, how can we be actually certain of their existence? We can feel their manifested truths in our emotional selves, and through the works of humans - but not their actual forms.
Thats why I prefer to seek through Lifes Ways and not under the protected imagery that the bible and religion offers in the name of God. Rather than seek answers, is it not better to spend the time seeking truths in every spiritual avenue and realisation that One ideology/religion can create suffering and evil?
I would find the judgement of myself upon death ( a life review ) far worse than being sectioned off to heaven or hell. If God exists, how can he accept Christians like George Bush who commit terrorism, or send countless people off to control and subdue others in the name of Peace. or whatever glibe terms his press secretaries make up?