Vulcans are quite spiritually-minded..
Spock, traveling back in time to save his own life, presents himself to his parents as a cousin making a ritual journey "to honor our gods". (Star Trek TAS: "Yesteryear").
Vulcans, like many other races, believe in a spiritual place from which they as a people were born. Their name for this place is Sha Ka Ree ("Star Trek V")
In fact, the whole Star Trek franchise is richly laced with religious references..
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An alien 'god' demands Kirk worships him but Kirk replies-"Mankind has no need of gods, we find the One quite adequate" (OST: 'Who Mourns for Adonais")
The rebels on Magna Roma, a nearly perfect "Parallel Earth", seem to worship the "sun", which Uhura discovers is actually God's "Son" Jesus. (OST: "Bread and Circuses").
In the wedding chapel on the Enterprise we can see a sort of altar and some religious symbols, among them a cross (OST: "Balance of Terror").
The computer M-5 states: "Murder is contrary to the laws of man and God" (OST: "The Ultimate Computer").
Dr. Ozaba quotes from the Bible- "In His hands are the deep places of the Earth. Psalm 95, verse 4." (OST: "The Empath").
Dr. Phlox says he has been to a Tibetan monastery and that he has attended a mass at St. Peter's Square. (ENT: "Cold Front").
Bridge officer Lt. Rhada is wearing a bindi, a traditional Hindu symbol, on her forehead (TOS: "That Which Survives")
Edith Keeler runs a Christian mission and soup kitchen in New York in the 1930s (TOS: "The City on the Edge of Forever")
Data mentions a Hindu Festival of Lights in his log entry (TNG: "Data's Day")
There is a mention of a Christmas party (TOS: "Dagger of the Mind")
The Caldos Colony includes a church or chapel and we can hear the attendees say "Amen" (TNG: "Sub Rosa")
The American Indians on Dorvan V continue to practice their old rituals such as vision quests. Picard says he has the deepest respect for them (TNG: "Journey's End")
Kilana asks Sisko: "Do you have any gods, captain?" He replies- "There are things I believe in." (DS9: "The Ship")
Sisko recites from the Bible to his son's surprise. He also appears as a priest in Ben's hallucination (DS9: "Far Beyond the Stars")
Kasidy says she would like to have a priest to perform the wedding ceremony (DS9: "Penumbra")
A church in ST Voyager: "Spirit Folk"-
P
icard celebrates Christmas with his family in the Nexus ("Star Trek Generations")-
MORE excerpts-http://www.ex-astris-scientia.org/inconsistencies/religion.htm