I spent quite a bit of time on the thread you started on that site. It's interesting that there are enough people there to create a website that holds to what is traditionally a fundamentalist concept, but still make allowances for science in Christianity. I can actually relate to this, while disagreeing with them at the same time.
I came from a fundamentalist (Baptist) extended family that shared a house with two separate flats. Grandparents upstairs, and my immediate family downstairs. My grandmother first laid out her religious truths when I was in the youngest of my formative years. And she didn't wait for me to learn how to think. I don't know how old I was, but I only have a few memories that are old enough for me not to have yet developed a sense of time and my place in it. I remember her telling me about the most important thing in life, and I remember it vividly because it was an absolute horror story, and the first time I ever heard about God and his grand plans.
My father and uncle had been indoctrinated years earlier and I attribute much of my father's misery and depression to her teachings, although much of his problems may have been due to chemical imbalance, so I'll just say Grandmother didn't help. My mother was not a fundamentalist, and must have put her foot down and told my father that her children were not going to be raised that way, so in the downstairs flat we settled on the less horrifying Lutheran Church. But Grandmother's first introduction to the "true" god was now well ingrained deep in my psyche. My mother must have had words with my grandmother about taking responsibility for my religious upbringing, but all I really know is there was some bad blood between them, which was never discussed in detail.
So around the age of 5, I started to question religion. Some of it made no sense, and the situation was not helped by absurd Bible stories, but I managed to hang on to a faith over the years by making up a new Christianity and continually modifying it, much like the YEC people in your forum do. I considered myself a Christian, but not a Lutheran, Baptist, or even Bible Christian. I was never able to reconcile Bible Christianity with the reality around me. In my early 50s, I had a dramatic insight. I was an atheist, and probably had been for years, while trying to pass as a believer, because atheist is an ugly sounding description to me.
It's not that Bible Christianity, Christianity, Mormon, my modified versions, or Buddhist religions were absolutely wrong. It was just that I could find no compelling evidence to believe in any of them.
Your guys don't seem too bad, actually. And for what it's worth, my two closest friends where I have settled in the last 15 years are a married fundamentalist couple.