As-Salaam alaikum,
For us, Muslims, it is imperative that we follow( in all we do in life) the Sunnah (example) of the Noble Messenger of Allah, Prophet Muhammad, may Allah Bless and give him peace. In this, there is no question of failing. Indeed, our Lord... Allah, jallah-Jalalahu, says:--

"SAY (O MUHAMMAD): MANKIND! I AM THE MESSENGER OF ALLAH TO YOU ALL- (THE MESSENGER OF) HIM TO WHOM
BELONGS THE SOVEREIGNTY OF THE HEAVENS AND THE EARTH. THERE IS NO god ONLY HIM. HE GIVES LIFE AND DEATH.
SO BELIEVE IN ALLAH AND HIS MESSENGER, THE UNLETTERED PROPHET, WHO BELIEVES IN ALLAH AND IN HIS WORDS, AND
FOLLOW HIM THAT YOU MAY BE GUIDED." (7:158)

This ayat shows us that Muhammad, Sallallahu alaihi Wasallam, is the Guide for all Mankind. Noor Muhammad is the First Creation by Allah, and everything else was created from that Noor or Light. As Noor Muhammad is placed in all Mankind, it follows that all Mankind from Adam to the last human being that will be born will need the guidance of this Noble Prophet, leading to the Court of Allah, the Almighty and Majestic Lord of the Cosmos.

Some one may ask, what is guidance? Guidance is something that cannot be seen by the eye. In other words, Guidance is light which cannot be seen by the eye. Allah Ta'ala speaks to mankind in allegories... meaning in analogy or comparison. Guidance is Light, it is Logic, it is Reason... guidance is Knowledge and/or awakening that leads man to God Almighty... just as the Holy Qur'an declares:--

"WE HAVE SENT YOU INSPIRATION AS WE SENT IT TO NOAH AND THE MESSENGERS AFTER HIM; WE SENT
INSPIRATION TO IBRAHEEM, ISMA'EL, ISHAQ, YAQUB AND THE TRIBES; TO ISA, AYUB, YUNUS, HARUN AND
SULEIMAN AND TO DAWUD WE GAVE THE ZABOOR." (4:63)