Right. And I'm sure the same is true in philosophical discussion of morality.
But if either one is not transcendent, then it's a fiction. If the laws of morality and mathematics aren't really transcendent, then they aren't really real in the sense that "mathematical claim A" or "moral claim B" can ever be "right" or "wrong." It may be that we are deceiving ourselves when we believe in math and morality, and that the things we think these laws make "right" aren't really "right."
But unless that is the case, then we're back to them being transcendent.
You do realize that transcendent basically means, not real, don't you?
For instance, if something transcends existence, then it is beyond, or outside of existence, which means, it does not exist.
Reality is that which is (exists). Therefore, anything which transcends existence cannot be real. And, anything which transcends reality cannot exist.
But, since you seem to believe that morality is a topic of philosophy and not more specifically of philosophy of religion, then you are probably not all that familiar with philosophy on the whole.
Fiction, by the way, is the negation of reality.
In philosophy, in general, we have the topic of ethics, which is the secular/philosophical equivalent of morality, but without the necessity of divine revelation.