Personally (As an Atheist) I find the New Testament to actually be a far better piece of reading material then the old testament. Jesus' moral teachings for the most part were wonderful, I'm not 100% why you don't believe in it. By not believing in the New Testament and Jesus Christ you are by definition no longer a christian.
This neo-christianity, perfectly explains the flaws of religion and it's Creation assertions. Christians are now using science to further explain or rationalize their beliefs by using the popular "Big bang - God did it!, Evolution - God did it!, Earth - God did it" This is of course a null argument that provides not evidence or logic other then making assumptions with nothing to back them up.
This is so wrong I don't even know where to begin. For one we don't need to DISPROVE god, it is the creationists that need to do the proving. This is the basis of a rational argument, without it, these debates cannot exist. You're right, we do not know for sure what started the big bang, but there are numerous theories that do not require the divine intervention you are suggesting.
And to finish off, the argument for believing in a god (or a higher power) is an irrational argument, so nothing rational explains gods existence.
You're right they are both Models of sort, one a rational model, the other an irrational model. One model has evidence to support it, as do all scientific models, Creationism on the other hand, doesn't have ANY evidence to support it's argument.