Progression of mankind based on certain belief in the appearance of the Mahdi (A.S)
The way we have progressed as human beings from time immemorial may point to future direction of humanity. Based on history, human beings have been pursuing a path of pure materialism along with its selfish moral and social values. And as long as we, as human beings, are not brought back to our spiritual origins, it is impossible to imagine how a God-centered human society can materialize.
With materialistic consumerism at its height, and individualism and secularism functioning as its two wings, God and God's ethical and spiritual directives have been practically trivialized and systematically removed from our public life. At the same time, there is this natural urge in human beings to seek out their Creator, to worship the Merciful, Compassionate God. Until and unless that is satisfied human beings will not find peace and harmony.
Islam has emphasized this natural urge of humanity as it is founded upon an innate disposition to worship One God. The divine leaders of Islam also sought to implement the Will of God on earth by creating an ethical and spiritually-oriented society.
It is only when humanity acknowledges a God-centered universe that it will be able to further the ideal global community. Such a community will naturally respond to the call of Islam and the Prophet of Islam (PBUH) whose invitation to the peoples of the Book was to abandon differences and concentrate on One Lord, the Almighty God, as is enshrined in the Holy Qur'an.
"O People of the Book! Come now to a word common between us and you, that we serve none but God, and that we associate not aught with Him, and do not some of us take other as Lords, apart from God." (Surah Al 'Imran, verse 64)
The Qur'an presents this revolutionary program of creating an ethical order that will reflect the divine Will on earth through God's righteous servants who have submitted themselves to His will. The Prophet has also informed us that the uniquely qualified person to lead humanity to become united under Allah by abandoning all forms of idolatry and concentrating on the divine purposes for humanity will be the promised Mahdi (A.S), a descendant of his.
A God-centered human will therefore materialize, based on our certain belief in the appearance of the Mahdi (A.S). The Holy Qur'an says:
"Allah has promised to those of you who believe and do good that He will most certainly make them rulers in the earth as He made rulers those before them, and that He will most certainly establish for them their religion which He has chosen for them, and that He will most certainly, after their fear, give them security in exchange; they shall serve Me, not associating aught with Me; and whoever is ungrateful after this, these it is who are the transgressors." (Surah An-Nur, verse 55)
source : www.tebyan.net