I don't believe in astrology.
I know that some of my religion believe in it, but it's one of those things where I really don't see why it should work the way it's claimed to work (especially with all the differences between cultures, and with calender reforms, discovery of other planets etc.) and I don't really feel like taking a leap of faith in regards to this matter.
If I would believe in it against better knowledge, then that would be against my religion. If I believe in it because I found reasons to do so that convinced me, then it wouldn't be against my religion.
If I believe in it to try it out and check whether it works when I believe in it, but then drop it when/if I notice that it doesn't work, then that's not against my religion either.
I guess not all here got the joke...