Spoiler :




I think that you have to give a book to a witch first or to make some other quests.

You can't solve all the quests staying in the temple area.
You have to go outside.

Then you will meet the witch Kiya near the entrance of the Temple area.
Talking to kiya open the crypt.

Maybe that you have to solve several quests for getting a good rank and then you can meet Kiya (I don't really know !!!).

After the quest with Kiya you will be able to go to the Church.

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