What should a Muslim son who is 18 years old and performs his prayers do, while his father becomes angry about him going to the mosque and prevents him from accompanying his committed friends, knowing that Allah's pleasure lies in the parents' pleasure, and his father is displeased with him because of prayer?

We praise Allah for your eagerness to pray in the mosque and to associate with the righteous.

Regarding your father preventing you from going to the mosque: If the mosque is close by and you can hear the Adhan without a loudspeaker, then praying there is obligatory, and it is not permissible to obey your father in a matter that constitutes disobedience to Allah. However, if it is far away and you cannot hear the Adhan without a loudspeaker, then praying there is not obligatory for you, but it is recommended (mustahabb).

If praying in the mosque is recommended and your father prevents you, then it is obligatory to obey him if he has a valid reason, such as needing your help or fearing harm for you on the way. However, if he has no valid reason, then there is no obedience to him, especially if you fear for your steadfastness and faith, because praying in the mosque is one of the means of steadfastness and increasing faith.

One must be cautious about obeying parents in abandoning sunnahs or obligations on a continuous basis without a valid reason, as this leads to the loss of religious rituals, especially in these times when ignorance has spread.