I think the distinction between "rejection" and "failure to accept" is important.
Sure, there are theistic arguments that I've heard or read, carefully considered, and found holes. And I can articulate why I think the holes are actually holes.
However, there are plenty of theistic arguments that I haven't heard or read that I know are out there. I've never read Lee Strobel's The Case for Christ or Josh McDowell's Evidence that Demands a Verdict. Do I reject their arguments? No - I don't even know what they are. I've heard some Christians claim that both books give compelling arguments for God and Christianity, but I don't trust these assessments.
Not only haven't I read either book, but I don't have any plans to read them. I don't have a whole lot of time for reading, and I'm still trying to work my way through Guns, Germs and Steel and Mark Twain's autobiography. I imagine that I'll find other books that interest me so that Strobel and McDowell will never get to the top of my reading list.
So... I know full well that there are at least two bookfuls of arguments for the existence of God out there, but I have no plans to evaluate these arguments and I think that it's still quite reasonable to call myself an atheist.
Am I being unethical?