CK II - Cannot secretly convert to close relation's religion

[Schiltrus]

One line summary of your issue
Cannot secretly convert to close relation's religion

Game Version
3.0.1

What expansions do you have installed?
All of the above

Do you have mods enabled?
No

Please explain your issue is in as much detail as possible.
The option to secretly convert to a spouse or concubine/consort's religion is currently broken. It was working in 3.0.0, but a hotfix after the release broke it.

Steps to reproduce the issue.
Load up the game as any unmarried character, find a spouse of a different religion. The option to secretly convert is absent from the menu. This means that the "potential" section of the decision is broken.

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[qinq_net]

This seems to be caused by a wrongly written trigger checking DLC for the target religion, which wrongly treated Christianity as unplayable.