If as you say you understand the rules of astrology and do not believe they work, then
one who follows those rules cannot receive
your endorsement since you reject the whole system. In a world that has enough dysfunction,
an inconsistent practitioner whose system and practice are
helpful would be more valuable than a consistent practitioner whose system and practice are unhelpful. If they are helpful in matters of degree, the more helpful one would be the better practitioner.
Doesn't the world have enough dysfunction without
endorsing practices, which, on the other hand, you do not believe in?
And if you are saying you believe they are on balance "helpful," do you not think they are probably in some measure "true" or believeable?
I think Jesus' message resonated very well on
an agnostic level -- perhaps better than on the true believer level, since he did not say a theology is unalterably true and therefore you must believe it, but instead is quoted as teaching in many ways that your own choices and beliefs and intentions are creative.