The point I was trying to make was that the Revelation of Baha'u'llah is not a gospel because there is only
one gospel, the gospel of Jesus Christ. That is why Paul said what he said in Galatians 1:8-9.
By placing our faith in Baha'ullah, as the return of Christ, Bahais are not demonstrating belief in another way, since we believe that Jesus came to abolish sin and death, but our understanding of how that was accomplished is different from the orthodox belief of Christians. What Baha’is believe regarding how Adam brought sin into the world and how Christ saved us from that sin is explained below:
Question.—In verse 22 of chapter 15 of 1 Corinthians it is written: “For as in Adam all die, even so in Christ shall all be made alive.” What is the meaning of these words?
Answer.—Know that there are two natures in man: the physical nature and the spiritual nature. The physical nature is inherited from Adam, and the spiritual nature is inherited from the Reality of the Word of God, which is the spirituality of Christ. The physical nature is born of Adam, but the spiritual nature is born from the bounty of the Holy Spirit. The first is the source of all imperfection; the second is the source of all perfection.
The Christ sacrificed Himself so that men might be freed from the imperfections of the physical nature and might become possessed of the virtues of the spiritual nature. This spiritual nature, which came into existence through the bounty of the Divine Reality, is the union of all perfections and appears through the breath of the Holy Spirit. It is the divine perfections; it is light, spirituality, guidance, exaltation, high aspiration, justice, love, grace, kindness to all, philanthropy, the essence of life. It is the reflection of the splendor of the Sun of Reality.
All sin comes from the demands of nature, and these demands, which arise from the physical qualities, are not sins with respect to the animals, while for man they are sin. The animal is the source of imperfections, such as anger, sensuality, jealousy, avarice, cruelty, pride: all these defects are found in animals but do not constitute sins. But in man they are sins.
Adam is the cause of man’s physical life; but the Reality of Christ—that is to say, the Word of God—is the cause of spiritual life. It is “a quickening spirit,” meaning that all the imperfections which come from the requirements of the physical life of man are transformed into human perfections by the teachings and education of that spirit. Therefore, Christ was a quickening spirit, and the cause of life in all mankind.
Adam was the cause of physical life, and as the physical world of man is the world of imperfections, and imperfections are the equivalent of death, Paul compared the physical imperfections to death.
Some Answered Questions, pp. 118-120
Read more:
29: EXPLANATION OF VERSE TWENTY-TWO, CHAPTER FIFTEEN, OF THE FIRST EPISTLE OF ST. PAUL TO THE CORINTHIANS
Abolishing sin and death was part of the mission of Jesus, it was not the mission of Baha'u'llah. As the return of Christ, Baha'u'llah came to renew the Holy Spirit on earth and to bring the blueprint instructions that humanity will need to build the Kingdom of God on earth.
There is only one man Jesus but the Christ Spirit returns whenever God sends a new Messenger.
If you take John's word then the same Jesus is not going to return to earth (John 14:19, John 17:11, John 17:4, John 19:30) and that means that the references in the Bible to the return of Christ must be about another person.
I do not know what verses lead you to believe that Jesus Christ baptizes from heaven so I cannot offer any opinion on this.
My belief is that the Holy Spirit is sent to earth in every new age whenever God sends a new Messenger (Manifestation of God). It is the Messenger of God who manifests God on earth and brings the Holy Spirit from the Father.
Baha'is believe that Jesus was a Comforter because He brought the Holy Spirit, which is the Bounty of God that comforts people, and we believe that Baha'u'llah was
another Comforter as well as the Spirit of truth that Jesus promised to send from the Father in heaven. What Jesus said in John 14 flows from one verse to the next verse.
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; -- Jesus says that the Father (God) will give us another Comforter. Jesus was the first Comforter and Baha’u’llah was the second Comforter.
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for hedwelleth with you, and shall be in you. – Jesus says that the world cannot see or receive the Spirit of truth (Baha’u’llah) because we do not know him
yet, since he has not come
yet; but the disciples know the Spirit of truth because it is
the same Holy Spirit that resides in them as a result of Jesus. Iows, the Holy Spirit Baha’u’llah will bring is the same Holy Spirit that Jesus brought, since it is the Bounty of God which never changes.
18 I will not leave you comfortless: I will come to you. – Jesus said He would come but if you tie that together to the two verses above, we can see Jesus did not mean He would come in the same body, but rather the same Spirit would come (another Comforter). Moreover, he could not have addressing only the disciples, because neither Jesus nor Baha’u’llah came during their lifetimes.
19 Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also.– Finally, Jesus made it perfectly clear that the world would not see Him again after He left; but we will see Him because His spirit lives on forever. As a result of believing in Jesus we will gain eternal life.