Game crashes if one have joined Taurog and converts a glyph. Log-file says something about 'AddPiety' , so i think the glyph conversion is the problem.
If straight joining Taurog doesn't reproduce the bug: I think in both cases i descerated another gods and then converted to Taurog (from another god).
EDIT1: Doing the same with Dracul (joining Dracul, descerate another god, convert healing-glyph) leads to no crash.
EDIT2: Directly joining Taurog and converting glyphs makes no problem. Then converted to Dracul, bought the 'agnostic collar' and descerated Taurog -> new crash
=> Taurog is cursed