According to Baha'i who or what is satan please? Who is the one who will be cast out as in; 30Jesus answered and said, "This voice has not come for My sake, but for your sakes. 31"Now judgment is upon this world; now the ruler of this world will be cast out
The Prophets of the past have spoken of one who is called Satan or Devil, and have said that he is the cause of wickedness in the world. Then they prophesied that there will come a time that this Devil would be removed and Righteousness would appear on earth. They Marked that Day to come 6000 years after Adam.
The People of the past who understood these terms literally and outwardly, have imagined that there is actually a person in the world who is Satan that influences mankind and causes them to do sin. Therefore in their mind, the very moment this Devil or Satan is removed, then all the sudden Righteousness miraculously appears on the surface of earth.
In Baha'i view, the Prophets of the Past have spoken in symbolic language.
What they meant by Satanic force, was the selfishness, lack of spiritual qualities and understanding which is the cause of wickedness.
Those Prophets prophesied that after 6000 years period a New World would appear, the Lord comes and the Righteousness appears. Some called it New Age. Some called it Age of enlightenment...
That period ended in year 1844, which can be calculated consistently from several Prophecies in Hebrew Scriptures, New Testament, Quran and Hadithes. (At least in 5 ways)
In the same year as prophesied a New Revelation came from the Lord, who is the cause of enlightening of Mankind.
However, let me give an analogy. Suppose we are told in Spring the life comes to nature and the trees and plant become green the fruits appear. We are told 21st of March is the Day that Marks Spring.
Then when 21st of March comes, you say, how come the fruits are not there and still so many trees and plants are not green yet.
The Point is All the effects of spring is not manifested in the very same Day.
Likewise, just at the end of 6000 years and the very same Moment the effect of a new world is not Manifested completely all the Sudden. But its effect is Manifested gradually and it fruits appear in the Summer of the Revelation.
Most people who are realistic agree that since the 19th century we have moved to a new era of human civilization and the world has become a new world.
Notice in chapter of Revelation it was prophesied when the Promised Age comes, He would make the world new:
"Behold, I am making all things new" Rev 21:5
And in Baha'i writings it was said 100 years ago:
"Now the new age is here and creation is reborn. Humanity hath taken on new life. The autumn hath gone by, and the reviving spring is here. All things are now made new. Arts and industries have been reborn, there are new discoveries in science, and there are new inventions; even the details of human affairs, such as dress and personal effectseven weaponsall these have likewise been renewed. The laws and procedures of every government have been revised. Renewal is the order of the day.
And all this newness hath its source in the fresh outpourings of wondrous grace and favour from the Lord of the Kingdom, which have renewed the world. The people, therefore, must be set completely free from their old patterns of thought, that all their attention may be focused upon these new principles, for these are the light of this time and the very spirit of this age."
Bahá'í Reference Library - Selections From the Writings of Abdul-Bahá, Pages 252-253
Notice that when Bahaullah appeared about a one and a half century ago He wrote:
"Soon will the present-day order be rolled up, and a new one spread out in its stead. Verily, thy Lord speaketh the truth, and is the Knower of things unseen." Baha'u'llah
Many people do not see how a Revelation from God can be the cause of advancement in human civilization. In Baha'i View and as I also quoted from Bible and Quran, a Revelation of God cause advancement of New Human Civilizations. Because through the guidance that comes, humanity is moved in the right direction.
If we look at the time before 19th century, there were wars, Kingdoms against Kingdoms. The slavery was a regular practice. Even Bible does not prohibit it except for kidnapping. The racism was a regular thing. White was considered superior to black. The Women did not have the right to vote.
All these things existed for thousands of years, and all the sudden in the last 150 years all these started to either vanish completely or significantly be reduced and be considered old and obsolete.