Exellent application.
However, Dailor is correct. We only take Forsaken (Undead race to be specific) into the Cult. Main reason is usually the fact our events are mostly spoken in Forsaken. If we let other races in, they would all need to get Tongues and all of our members would have to use it. And we don't want to force anyone to use a mod.
Another reason is that the Cult is the largest and oldest (and at times, the only) undead only guild on Defias. Letting other people in could bring us many good RPers, like you. But it would also take away a bit of what we are.
Because of this, I'm sorry I have to reject your application.
However, as Dailor said, we're beginning to support an independent tavern project, which is open for all races. We also have undead only Sermons every thursdays at 20.00. These are ICly undead only, meaning that deathknights can attend too. Needless to say you're welcome to visit both occasions.
If you don't mind the model, we have some who've picked undead race, but RP an undead sin'dorei/quel'dorei. If you're still interested in joining, you might give that a try.
One loophole into the Cult is also to roll and apply a Forsaken alt, which gains you an access to our OOC channel (which is open for alts too). And you can see our calendar to search for events you might visit.
But I really recommend visiting the tavern event tonight. We're planning a project to unite and rouse the Forsaken RP community, which will be open for all undead guilds and guildless.
I don't know, how strict the new apothecary guild is, but you might want to try asking, if they accept non-forsaken. There is also Sunfury Elite, a blood elf guild with powerhungry elves - much like powerhungry undead - a guild we cooperate with from time to time.
If you're looking for Horde RP, you might want to seek those out too.
So, I wish you luck in your endeavour, I hope my post shed some light into the reasons and gave you advice.