ANSWER:

It is not permissible for a Muslim to skip a prayer intentionally as this is one of the major sins in Islam. 

If one persists on skipping prayers, this might take him out of the fold of Islam. 

However, if a person repents and commits to his prayers on time and avoids sins to the best of his ability, this won’t impact his previous good deeds in sha Allah. 

QUESTION: I live in H**d* anti islam family and my family don’t know I am Muslim, Sometimes I sin and deliberately don’t pray and then repent. Will all of my past good deeds go away? Will all of my deeds invalidated?