There are many witnesses to the crucifixion, even the Jews recorded the death of Jesus in their Talmud. The Old Testament also prophecied the crucifixion. Jesus himself said that he would die on the cross as ransom for everyone who believes in it. So much evidence, but 600 years later a god suddenly comes along and says this without showing any evidence:
They certainly did not kill or crucify Jesus. (Quran 4:157)
Baha'is believe that the Qur'an is correct, but we have a different interpretation of the verse from Muslims.
Qur’an 4:157
And [for] their saying, “Indeed, we have killed the Messiah, Jesus, the son of Mary, the messenger of Allah.” And they did not kill him, nor did they crucify him; but [another] was made to resemble him to them. And indeed, those who differ over it are in doubt about it. They have no knowledge of it except the following of assumption. And they did not kill him, for certain.
Do Baha’is believe Christ was crucified?
Abdul Bahá calls him a martyr, in Some Answered Questions, but also the Quran states that Jesus wasn’t crucified and rather made to look like he was. What is the official Baha’i view, and if it isn’t compatible with the Quran, why not?
Hope this helps you in your spiritual quest.
"Though we cannot imagine exactly what the Manifestations of the remote past were like, we can be sure of two things: They must have been able to reach their fellow-men in a normal manner-as Baháu'lláh reached His generation, and They were sent from God and thus Divine Beings. The crucifixion as recounted in the New Testament is correct. The meaning of the Quranic version is that the spirit of Christ was not crucified. There is no conflict between the two."
(From a letter written on behalf of Shoghi Effendi to an individual believer, July 14, 1943)
Here's another related passage
"Regarding your question relative to Surih 4, 156 of the 'Quran' in which Muhammad says that the Jews did not crucify Jesus, the Christ, but one like Him; what is meant by this passage is that although the Jews succeeded in destroying the physical body of Jesus, yet they were impotent to destroy the divine reality in Him."
(From a letter written on behalf of the Guardian to an individual believer, March 19, 1938)
https://www.reddit.com/r/bahai/comments/ddig8d/do_bahais_believe_christ_was_crucified/