Before I answer about how I was raised, I feel like I should clarify about my beliefs, which is hard for me to do. As a young man, I had myself convinced I was an atheist, but looking back I think that was more just rebellion against organized religion, which I threw in with the rest of the "establishment." I too was an "oops baby," my two brothers are 8 and 10 years older than me, and I tended to try and emulate them, except I took it to the nth degree - they got their rebellion out of the way during their teens, whereas mine continued well into my 20's. But later on in life I've come to realize that the atheists are doing exactly the same thing - claiming to know the absolute truth about something that is unknowable. And that is at the crux of what I believe today. The entity that we call God is something way more mystical and fantastic than we on Earth have the power to understand, and it is the ultimate conceit to tell someone that they have to believe the same as you do or they're going to Hell.
OK I was about to go on and on about my beliefs, but that's not what you asked. Just understand that I have given this a good deal of thought, and continue to do so today. When I was growing up, we went to a Methodist church on Sunday, but we really didn't discuss religion all that much at home. I do remember one of my brothers cussing and being told, "You will not take the Lord's name in vain in this house!", but we didn't sit down and discuss the Bible or anything like that. But there was a Christian summer camp that we all went to for a week or two every year, and I have some great memories from there. Looking back now, I have to think my parents chose the Methodist church out of convenience more than ideology. My father came from a long line of Seventh Day Baptists in Wisconsin (Pardon Davis was my 3rd cousin, 3 times removed:
http://www.wlhn.org/wnf/stories/pardondavis.htm) and while I've never asked, I would assume my mother was raised Catholic, since her mom was French Canadian and her dad was Dutch.
So I guess the short answer would be that I am one of the people you're talking about, in that I was raised by Christians, but I don't believe you have to be a Christian to be a good person. And I suppose you think this proves something or other, I'm not sure what. I would just like to point out one thing: Only 30% of the nearly 7 billion people on this planet adhere to the Christian faith. Of the remaining 70%, I daresay there are quite literally BILLIONS of people who lead extremely moral and ethical lives, without, as you put it, an OUNCE of Christ.