God and the question of religious diversity

Assuming that God exists, one often wonders about God's attitude towards various religions in this world. Does God approve of some or one religion(s) over the others? If that is the case, is it unfair, given that each one of us are born into different religious (or non-religious) backgrounds? I suppose, God is behind all people, based on their desire/willingness for truth, values etc. Mere birth in a religion or professing a religious identity should not be a major issue. Religiosity is sometimes expressed in very negative ways. A man who shouts 'Allah-ho-Akbar' before blowing up innocents or a violent hindutva murderer/rioter shouting 'Jai Shri Ram", or a crusader with a cross on one hand and a sword on the other etc may all belong to a 'religion' but God is not behind them. On the other hand, God is behind every one who has desire/openness for truth, values, moral standards etc. If God is just/fair, all such people will be led/helped on the path of truth and righteousness.