What is the ruling on one who does not adhere to the commands of the Shari'ah until he grows old and comes to the Ka'bah to repent and passes this concept on to his children?

Question:
He says: In many Muslim countries, a mistaken understanding has taken hold of the fact that the mercy of Allah encompasses all things. As a result, people no longer respond to enjoining good and forbidding evil, and they engage in everything that is forbidden. When they reach old age, they come to the House of Allah, the Sacred, weeping, humbling themselves, and clinging to the curtains of the Ka'bah, whether for Hajj or 'Umrah. Then they return to their country satisfied and reassured that Allah has forgiven them for their past sins, and they pass this concept on to their children after them. What is your comment? May Allah reward you with good.

Answer:
First, it is not permissible for a person to engage in matters he does not know or understand. This is forbidden. This is speaking about Allah and His Messenger without knowledge, and lying about Allah and His Messenger is the greatest lie. And from , and lying about the truth, it is not permissible for a person who fears Allah the Exalted to speak about matters of knowledge while he is ignorant. He must learn the correct knowledge. And when he learns it, he will hold his tongue, fear Allah the Exalted, and not speak except about something that benefits him and benefits people, and he will remain silent about what does not benefit people.
And he does not enter into what does not concern him. As for the second point, Allah accepts the repentance of one who repents when he comes repentant, circumambulates the House, and performs Hajj or 'Umrah repentant; Allah accepts the repentance of His servants. But the evidence for the validity of the repentance is the rectification of his actions afterward. Does he, when he returns, rectify his actions, repent to Allah, maintain the five daily prayers, maintain the obligations of Allah, and avoid the prohibitions of Allah? This is evidence of the truthfulness of his repentance.
As for the one who says, "I repented and Allah accepted my repentance," and then returns to sins and disobedience, this is evidence that he is a liar and that Allah did not accept his repentance. It is not the case that those who repented and reformed merely repented; they reformed their deeds. If, when he returns to his country, he has repented, is turning to Allah, is maintaining the obligatory duties, and is avoiding the prohibitions of Allah, this is evidence of his truthfulness, and Allah accepts the repentance of His servants. But if he comes and performs Hajj and thinks that Hajj expiates everything that has happened and everything that will happen in the future, this is arrogance, ignorance, and deception by Satan.