ok Ruty, an answer to your question about why throw out all christianity because of faults in the church.
and also to Majorstress about possibly throwing the baby out with the bathwater.
First, I was very convinced by knowing a number of highly caring, loving, sociallly and politically active atheists. Christianity and other religions do not have any sort of monopoly on social justice, care for the planet and its inhabitants, etc. in fact I often find the atheist/humanist perspective more thorough in concern for the environment etc (for instance, many (all?) Christians believe that the world will end when God chooses, so really there's not the same imperative to conserve the planet's resources. For atheists and humanists, there is no such expectation, people feel they have to be proactive and work to change things because God isn't going to nip in and save or destroy things at the last minute. Yes there are many green christians but there is not the same urgency that there is for the humanists and atheists who believe that there is no other solution than human activity and concern for others.
Second. for me, personally, by the time I had discounted the authority of much of the old testament, various bits of the new testament (particularly, concerning gender, the letters of Paul and Peter - i am rusty on all that now but knew the details very well at the time, but also Jesus's behaviour himself - i used to think, why hadn't jesus just SAID something positive about women so that there would be no question about our right to exist beyond being containers and carers for the males of the species), discounted the often shameful and appalling history of the church with respect to the rights of women, people in developing countries, lower classes, slaves, homosexuals, etc; and discounted the current church and its preoccupations and priorities - all the "bathwater" - there was really so little "baby" left for me in Christianity it was not a viable living organism, to stick with the metaphor.
For me, if "true" Christianity is not manifested or sufficiently exhibited in Old or new testament, or christian history, or current church activity, it's really not very convincing. At some point I do think a religion has to be judged by the behaviour of it's followers. I don't feel it's enough to just take a few favourite bits from the gospels and say "this is the essence of Christianity - yes there are some very nice bits of the new testament and some nice bits in the old testament. social justice quotes from Isaiah, bits about Love from the new testament. Sheep and Goats parable. but for me, if you just take a few bits you find palatable, and discount the rest, you might as well stand in the humanist or atheist camp which can also say, yes there are some good opinions now and then in the bible, and occasional positive bits in religion.
and which also permits you to say, yes, a lot of christianity absolutely sucks. That is my personal view. after i left it, very reluctantly at the time, i realised very quickly just how much i disagreed with how much of it at a very fundamental level.