Do you still have the greyed out image of your thief? Or has he vanished? If vanished you will not get him back, sorry.
If image still there any temple will raise him. Just make sure you have him highlighted, then click on the resurrect icon, then click on PAY. You need to have enough gold...
If an Elf, you will not get him back either, I think. I seem to recall something about not being able to resurrect elves...
However, you can create another thief for your team... but I think he will only be level one with no gear....
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Smile! Life is too short for bitching!
Fljotsdale