BismilLah.
The importance of the Friday prayer is evident from the mentioned proofs from the first and second reminder. A Muslim should, therefore, never attempt to miss it. To miss even one Jumu’ah prayer without a legally valid excuse is highly sinful, and to miss three is totally unacceptable, with Allah Most High sealing the heart of the transgressor due to which no good enters his heart.
However, missing the Jumu’ah prayer does not entail one leaving Islam, as is the case with all unlawful and sinful acts. According to the scholars of Ahl al-Sunnah, a sin does not take one out of the fold of Islam, rather one becomes sinful and life becomes difficult.
Thus, leaving three Jumu’ahs will not be considered disbelief (kufr), in that one will not have to repeat the Shahadah and renew one’s Iman. However, if one rejects the obligation of the Friday prayer or takes the matter lightly in a mocking way, then one will come out of the fold of Islam. May ALLAH keep guiding us all and aid us in our efforts to take all salaat with utmost seriousness it deserves AMIN
