There are many christian churches and religious groups that function more as social organizations than religious ones. I wish they organized around something besides religion as it would make it less confusing but I don't really have a problem with this. I just don't expect the same views and behaviors from them as I would from myself or from people who take their religious beliefs more seriously.
Most political leaders in the United States these days make only the most feeble attempts to convince constituents of their "faith". So it should not surprise you that this country is not a beacon of Christian values in policy or actions.
Another issue is that the Bible is quite thick, and it's very easy to forget that it's actually a collection of many different texts with very different importance, authors, meanings and context, and mistaking it with a coherent book to be taken to the letter. The tone of the Old Testament is very different from the New Testament, and people often forget that they were written at very different epochs, for very different audiences.