you have a birthday cake
Nothing. It's just decorative and it's easier for the designers to just send you that one, not one with a certain amount of candles.
take care of them and do not let the mean girl take your baby. Real answer (LGE edit) - you can make them age up (baby-to-toddler, toddler-to-child, etc), by buying a birthday cake, and having the sim you want to age blow out the candles. The cake in in buy mode - misc/party.
It means that the cake isn't exactly yours (as it would be on your birthday), but you are going to claim and / or eat it anyway (like you would with your name on it).
It means she wants you to know she cares for you.
It means that they are candles
Candles can represent lots of things
If you mean a cake that eats people, the answer is no. If you mean a man that eats cake, the answer is yes.
Las velas.
The light of God
Not sure what you mean, but unless question is made clearer, candles are not a resurrection of Jesus.
No but they have Devil's food cake on earth too. Does that mean they have People food cake in hell? (yes)