What is the purpose and goal of the Baha'i religion?

Answer 1

1) At the personal level: a transformation of characterthat will also affect religion and society:

"is not the object of every Revelation to effect a transformation in the whole character of mankind, a transformation that shall manifest itself both outwardly and inwardly, that shall affect both its inner life and external conditions?

(Baha'u'llah, The Kitab-i-Iqan, p. 240 ; http://reference.bahai.org/en/t/b/KI/ki-8.html#pg240 )

2a) The revival and reformation of religion:

Might there not emerge out of the agony of a shaken world a religious revival of such scope and power as to even transcend the potency of those world-directing forces with which the Religions of the Past have, at fixed intervals and according to an inscrutable Wisdom, revived the fortunes of declining ages and peoples? (Shoghi Effendi, The World Order of Baha'u'llah, p. 33)

2b) the removal of religious prejudices and antagonisms:

The Purpose of the one true God, exalted be His glory, in revealing Himself unto men is to lay bare those gems that lie hidden within the mine of their true and inmost selves. That the divers communions of the earth, and the manifold systems of religious belief, should never be allowed to foster the feelings of animosity among men, is, in this Day, of the essence of the Faith of God and His Religion. (Gleanings from the Writings of Baha'u'llah, p. 287 ; http://reference.bahai.org/en/t/b/GWB/gwb-132.html )

3) world unity and peace:

The fundamental purpose animating the Faith of God and His Religion is to safeguard the interests and promote the unity of the human race, and to foster the spirit of love and fellowship amongst men.

(Gleanings from the Writings of Baha'u'llah, p. 215)

All three together are expressed here:

They that are endued with sincerity and faithfulness should associate with all the peoples and kindreds of the earth with joy and radiance, inasmuch as consorting with people hath promoted and will continue to promote unity and concord, which in turn are conducive to the maintenance of order in the world and to the regeneration of nations. (Tablets of Baha'u'llah, p. 36 ; http://reference.bahai.org/en/t/b/TB/tb-5.html#pg36 )