Atheists are the "radicals" in this society. So, until we can become the majority, we HAVE to take things too seriously, or else we're not taken seriously at all. As atheists, we CAN win the creationists' own game. We all need to get together and deconvert one person at a time. Until then, we have to make our points known, I think. Besides, most Christians take religion too seriously, I think.
Of course, you don't HAVE to participate in debate and truth-spreading. But then, what are you doing here, exactly?