Many Muslims today follow everything except Islam. The issue of them being Muslim does not affect them. Following whatever pleases them and staying away from whatever displeases them. Letting their own desires and inclination run their life and pursuing nothing except self-interest and benefit, with no fear of Allah and complete disregard for Islam.
This lifestyle where Muslims set their own criteria for life is absolutely prohibited. As they put themselves before Allah and His commands, ending they obey and worship themselves. Allah condemns these kinds of people in the Qur’an:
“Have you seen him who takes his own lust (vain desires) as Ilah (god), and Allah knowing (him as such), left him astray, and sealed his hearing and his heart, and put a cover on his sight. Who then will guide him after Allah? Will you not then remember?”(45:23)
Mankind can only take themselves so far pursuing the enjoyments and pleasures of this worlds but we should remember that in the end we will all return back to Allah and be accounted for the way we lived our lives:
“…If we let them enjoy for years. And afterwards comes to them that (punishment) which they had been promised! All that with which they used to enjoy shall not aviail them.” (26:205-207)
Therefore, as Muslims we should not only believe in Allah and his Messenger but also believe in the divine way of life they have sent forth for us. Our lives should revolve around Islam if we wish to be successful in the hereafter. Everything from our belief, sayings and actions and even our inclinations and desires should be in accordance to Islam, as Allah mentioned in the Qu’ran:
“But no, by your Lord, they can have no faith, until they make you (O Muhammad) judge in all disputes between them, and find in themselves no resistance against your decisions, and accept them with full submission.”(4:65)