Must be a liberal arts school.
Seriously. BA in a science is a _huge_ red flag. Never hire them. Your school should reconsider, if only to avoid the resume stain effect. It would be like calling all the degrees education degrees. Sure it might make the education degrees a little more valuable, but it would fuck everybody else.
Sorry, but no, your blanket statement about science B.A.'s is just wrong.
I did my bachelors in Physics at Cornell. The only thing that was offered to Physics majors was a B.A., since the Physics department was in the Arts & Sciences college. And yes, I had 6 semesters of math (calculus, linear algebra, vector calculus, complex analysis, etc.) If you don't want to hire me because Cornell gave me an inferior degree, well, your loss.
In reality, the distinction between B.A., and B.S., often has quite a bit to do with how the particular university is organized, and has precious little to do with curriculum.