The Big Bang isn't based on faith, it's based on observations. For example, the observation that the galaxies are all receding. If they're receding, common sense tells that at some point, they were all one.
And Christianity is logical? Yes, any religion that's holy book speaks of stoning one's children if they go against the parent's beliefs is so logical. The idea that 2 of every animal can fit on a single Ark is so logical. The idea that woman is not only inferior to man and must serve him, but came from one of man's ribs, that's so logical as well.
So wait, a single "bad" thought will ruin a lifetime of good actions?
And I go back to the question of how your God is just and good and not a horrible, evil tyrant.
Say there was a leader of a country somewhere in the world. He kept all the power to himself, giving the people absolutely no power. Under his regime, women had next to no rights and had to follow the orders of men. Gays were punished with death. The people had no freedom of speech, no freedom of thought, and no freedom of expression. Any kind of knowledge was banned by the state, as knowledge was considered evil by the leader. Everything said by this leader was considered the rule of law, and it had to be followed perfectly, with execution being the judicial response for every crime. This leader would also perform massacres, sending his troops to any city in his country that he considered immoral to kill everyone in the cities. Men, women, children -- It wouldn't matter. This leader would rule on fear, on making his people fear his wrath.
What would we consider this leader? An ally? Absolutely not. He would be a tyrant, a dictator, and an enemy of the state. There would be, at the very least, huge economic sanctions against his country, and many people would certainly want to take military action against him.
The hypothetical political leader I described has the exact same traits and laws as the Christian God. Notice that the entire idea of Christianity is based on fearing God. Yet God is considered moral and just, yet any leader who rules on fear is a tyrant and a dictator. In Christianity, God is described as "vengeful" and "jealous". Those aren't exactly good traits.