Mocking Islam and its teachings is a serious act of disbelief that can take a person out of the fold of Islam. For those who have erred in this way, sincere repentance and a return to the path of faith are essential steps. Islam teaches that the Quran and Sunnah are too sacred to be treated with ridicule or contempt. So, it is vital to approach them with the respect and reverence they deserve, ensuring that our words and actions align with the teachings of our faith.

Allah has not commanded the person who repents to do Wudu or Ghusl, whether his impurity is minor or major, either before or after repenting, unless he is repenting from disbelief or apostasy.

All this person who mistreated his parents has to do now is hasten to repent for Allah has promised to accept the repentance of the one who repents. Regretting mistreating his parents is repentance in itself. After a parent's death, one can honour them by making a lot of du`a from them, doing righteous deeds on their behalf, and honouring their friends and loved ones.

Regret is repentance because it leads to the other essential components of repentance – namely giving up the sin and resolving not to go back to it, and restoring people’s rights wherever possible.