Yes... that's exactly true... If Baha'u'llah is who he claims to be. The bridge of any of the other religions to the Baha'i Faith is for them to realize that he, Baha'u'llah, is the promised one of their religions. He is Kalki, Maitreya and so on.
On one side of that bridge is their old beliefs and interpretations of their own Scriptures. On the other side of the bridge is what Baha'u'llah, and apparently, whatever
Abdul Baha' says is really true about that religion.
...The Cause of Christ was like a lifeless body; and when after three days the disciples became assured and steadfast, and began to serve the Cause of Christ, and resolved to spread the divine teachings, putting His counsels into practice, and arising to serve Him, the Reality of Christ became resplendent and His bounty appeared; His religion found life; His teachings and His admonitions became evident and visible. In other words, the Cause of Christ was like a lifeless body until the life and the bounty of the Holy Spirit surrounded it.
Such is the meaning of the resurrection of Christ, and this was a true resurrection....
"Some Answered Questions", rev. ed. (Wilmette: Bahá'í Publishing Trust, 1984), p.
104
From letters written on behalf of the Guardian
We do not believe that there was a bodily resurrection after the Crucifixion of Christ, but that there was a time after His Ascension when His disciples perceived spiritually His true greatness and realized He was eternal in being. This is what has been reported symbolically in the New Testament and been misunderstood. His eating with His disciples after resurrection is the same thing.
9 October 1947 to an individual believer
So, a Christian would leave behind the belief in the physical resurrection of Jesus on one side of the bridge. And on the other side come to believe that all four gospel stories were symbolic... No empty tomb. No seeing, touching, eating, or talking with Jesus. And to that you can add most all of the other beliefs and doctrines of Christianity. They got it all wrong... except the virgin birth. Baha'is are okay with that.
Baha'is completely gut Christianity. But don't feel bad. If people listened to me, the same thing would happen. I'd tell them that I think it's all a bunch of made-up myths and legends. But I'd include the virgin birth.
To be like you and some Baha'is, after I did that to them, I'd go to their Church service and tell them how wonderful and beautiful their religion is.
Just tell them the truth... Baha'is don't believe in Christianity. And that goes for how Baha'is feel about all the other religions. But Baha'is don't want to be that blunt. Or actually, as strange as it might seem, I think Baha'is really do think they believe in Christianity and all the other religions.