I'm an engineer, and have a great deal of scientific background and understanding. I'm also a Christian. So, I'm living proof that science and religion are not oil and water :)
First, from your subject line, he cannot put you in hell. While as an atheist I'm sure you don't believe in hell, from a religious standpoint only God can sentence anyone to hell.
Second, to answer your question, I think it is unusual for someone to reject science entirely but fully embrace religion as their answer. Usually it is the other way around...rejection of religion and embracing of science. While it cannot be proven, there are many theories about why the Bible is written with such seemingly terrible timeframes. For instance, it is thought that although Methuselah was said to have lived to over 900 years old, most likely he did not...the reasoning there being that age was sometimes seen less literally in those times and more like a "score" of how wise, wealthy, prodigious, and prolific the person was. Methuselah was a very well respected man for his time, and it is thought that his age was reflective of his merits and not of his actual age. Personally, I believe the timeframes in the Bible for the age of the world are figurative. From God's perspective, 1000 years for us is only an instant of time. Therefore, relatively speaking the age of the earth in the grand scheme of things is very young when considering the whole universe. There are many theological studies surrounding this concept, it's pretty interesting actually.
So, if that truly is their approach, I'm not sure that you will have much success in having a productive conversation with them if they have their mind made up. I also know some people who believe that, and they just choose to be ignorant because it's easier. I actually enjoy the challenge of trying to understand what I believe God created. Just agree to disagree and then change the topic to football or something...lol.