Faith does seem to involve believing in spite of something. Atheists jump on this and say that what believers are talking about is believing in spite of having no good reason to believe it, and good reason to not believe it.
However, we can, for example, trust that a spouse is going to be faithful even though the spouse is out of our sight. In fact, the Apostle Paul contrasts faith with sight, not reason. Unless seeing is the only way we can have a good reason to believe something, it does seem to me that we cannot say that reasonable faith is an oxymoron by definition.
I agree with him and I find that many Atheist make that mistake because they don't know what "Biblical faith" is. They even make the mistake of missing the obvious that there is no reason to reject anything of great importance if the best you can do is point to the improbability of it. And then to get mad at other who are unconvinced of the lack of evidence? Makes no sense.
dangerous idea: Is Reasonable Faith an Oxymoron?