Yes, some denominations think the Bible is a compilation of stories with moral content. They do not believe most of it is factual, including Jesus being born of the Virgin Mary. Some United Churches lean this way.
(My comment is supported by speaking with United Church adherents personally (extended family members) and hearing them tell me they believe the Bible is comprised of non-factual stories with moral content, many even thought to be fictitious) They informed me that their pastor teaches this way. This would be considered one of the very liberal United Churches.)
Here is a link to a United Church newspaper with a discussion between two lady ministers, one of them an atheist, to support the point that the Bible and its' content including the Virgin Mary and her conception of Christ without the help of a human man, is not necessarily believed, even by the clergy of this denomination. Point in fact, the minister in this article is not only not a believer in the Bible record of the Virgin Mary, but this minister herself does not even believe in God!
Note: quote from article:
"Vosper: *So let other denominations do it, and let The United Church of Canada — which is the only denomination on the planet that might ever actually say in its documents that the Bible is not the authoritative word of God for all time — move forward into discourse with others*."
Inside the umbrella group of the United Church resides a variety of beliefs, from more conservative individual churches with their more conservative pastors, to liberal individual churches with their liberal pastors, and many that fall in between. All would be welcome and included under the umbrella name of United Church. This is one group that has included the ordination of practicing homosexual pastors in their rulings.
Believing in Mary as an actual virgin who conceived Christ without the help of a human male contributor, would be optional in this denomination at best, and you would find a wide variety of beliefs about Mary in the churches under the umbrella of this name.
As their article title suggests, they have gone "Beyond Belief", as a denomination, into the division of their denomination into subgroups from which only thirteen percent believe that Jesus Christ was born of the Virgin Mary with no human male father, as the following UC article communicates.
quote from above:
"To 13 percent of survey respondents, however, it is straightforwardly true that Jesus was born of a virgin, performed miracles, died to save humanity or individuals from sin and rose physically from the dead."
This shows that 87 percent of those UC-ers asked about Jesus being born of the Virgin Mary, did not believe that He was.