It’s not that Sybok was right or wrong. He had a vision and he fully bought into it. What I wanna know is why Kirk wasn’t even a little interested. Imagine if the film played out much the same way until the revelation.
Kirk: “Your vision?”
Sybok: “Given to me by God. He waits for us on the other side.”
Kirk: “By…God?”
Sybok nods eagerly.
McCoy: “Jim, you can’t honestly believe God is talking to him.”
Kirk: “It’s obvious he believes it.”
Spock (concentrating): “Sybok does seem to be in contact with an intelligence of some sort. Extremely powerful, directed solely at him. But I can feel it.”
McCoy: “That’s crazy.”
Kirk: “Is it? Whether or not it’s actually God is irrelevant. What matters is that it’s an unknown life form. We have to seek it out. It’s why we’re here.”
Sybok smiles, allows the doors to open and gestures to the corridor.
Sybok: “After you, Captain.”
At that point, it becomes the crew's journey.