By Allah's blessing and mercy, Islam contains the complete and perfect guidance for humanity. Allah said:

"This day I have perfected your religion for you, have completed my favor upon you, and have chosen for you Islam as your religion."
[Noble Quran 5:3]

Islam did not neglect any information needed by people to achieve happiness and avoid harm, in all matters - small or large. It informs them of all that would save them from the Fire and let them into the Gardens in the Hereafter. This was the mission of all of the prophets, as declared by Muhammad Peace be upon him:

Never was a prophet before me, but he disclosed to his people what he knew to be best for them, and warned them of what he knew to be evil for them.

This was the mission of the Final Messenger (Peace be upon him) as well, as he said:

There is nothing that would bring you closer to Jannah and farther from the Fire but it has been clarified [by me] to you.

Some mushrikun (idol worshipers) tried to mock Islam by saying to Salman (may Allah be pleased with him), "It seems as if your prophet has taught you everything, even how to defecate!" Salman (may Allah be pleased with him) responded with dignity:

"Yes indeed! He prohibited us from turning our faces or backs to the Qiblah when defecating or urinating, from using the right hand to cleanse ourselves, from using less than three stones to cleanse ourselves [in the absence of water], and from using animal waste or bones to cleanse with."

With His encompassing Wisdom, Allah made His Final Revelation, Islam, a universal message for all peoples at all times, without any distinction:

We have not sent you [Muhammad] but to humanity at large, to be a herald of glad tidings and a warner.
[Noble Quran 34:28]

Furthermore, this most important Message is preserved intact through the centuries, as is clearly observed today by any impartial examiner. This is a fulfillment of Allah's promise:

It is We indeed who have sent down the dhikr (the Message), and it is We who shall surely guard it [from corruption].
[Noble Quran 15:9]

We conclude then that:

Islam contains the complete and perfect guidance for humanity.

Islam did not neglect any information that would be needed by people to reach happiness and to avoid harm, in all matters, whether minute or large.

Islam is the only guidance tailored for all peoples at all times.

Islam has been preserved, and will remain intact through the ages, as the only true guidance capable of helping and saving people. 
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