Where does gullibility come into this?
Facts, or at least told as if facts to me by Baha'is in 1970...
Baha'u'llah is the return of Christ. All the founders of all the major religion are all one and were sent by God. Baha'u'llah has fulfilled all of the prophecies from all the major religions about the return of an end-time prophet. He is the promised Comforter talked about by Jesus.
I hadn't read the NT or the Bible, so I took them at their word. In Baha'i writings, all those claims were verified as being things taught as true by the Baha'i Faith. I was around Baha'is for three years when a friend became a Christian.
Christianity was huge then. It was the middle of the "Jesus Freak" movement. I was in San Diego, and north of there, in Costa Mesa was Calvary Chapel. Every Saturday night they held a Christian rock concert. There were about 2000 young people there. Most of the guys had long hair and some had beards. All had smiles and a glow of something deep and spiritual.
My friend took me there and to local Bible studies. I learned the "truth" and the "facts" about what the Bible really taught.
Jesus came and died for sinners. Jesus is the only way for anyone to get to heaven. Without accepting his sacrifice, no one is good enough to get to heaven on their own merits. All of these things were verified by things said in the NT and the Bible. Oh, and the "Comforter"? Was not Baha'u'llah. It was the Holy Spirit. And Baha'is taught that the resurrection of Jesus was not a literal but was symbolic. In the NT, it was clearly a fact. Jesus was killed and then three days later rose again. He appeared to the disciples and ate with them, and they touched him, and he said, (paraphrased) "You see. I have flesh and bone. I am not a ghost. The Christians weren't lying. The "facts" were all there in the Bible and the NT and I believed them.
Three years later, after trying to believe, and being spiritually gullible enough to believe both the Baha'is and the Christians, I left Christianity. Now fifty years later, thanks to forums on the internet, I'm in a place where I can talk about religions and openly ask them questions that I couldn't ask back then. I'm no longer spiritually gullible. After experiencing religion, I have become spiritually skeptical.
But I will say again, both religions, when followed and believed, seemed to be true. For me, once doubts crept in? Neither seemed true.