How does Vathek develop the theme of Impiety and Blasphemy?

Vathek by William Beckford develops Impiety and Blasphemy across the chapters the companion marks for this theme.

Vathek engages in theological controversy with the orthodox, persecutes zealots, and is described by Muhammad as irreligious; his profane acts, like defiling a mosque, provoke divine punishment.

Vathek neglects his duties and engages in theological controversy with non-orthodox figures, showing disregard for religious norms.

The note on Vathek's profanation of ablution and prayer highlights his impiety.