No, this is false. It’s not a common theme in religion, its a common theme of those who want to discredit Christianity My suggestion is to look to history, namely written records and what each religion actually teaches. I recommend this website:
bringyou.to/apologetics/JesusEvidenceCrucifiedSaviors.htm
This states the actual beliefs of these religions and provides a genuine comparison between figures. When a similarity is there, it is conceded. So you can tell its not falsified by that fact.
Regarding Buddha, from my understanding, the claim of a virgin birth is taken from a specific interpretation of the account of his birth. By that I mean there are others. Contrast this to Christ, where there is no question in the Gospels. Mary was a virgin when she had Christ. There is a story in the Buddhist texts that states that on the night of the conception of Siddhartha Gautama, his mother, Maya, had a vision of a divine Bodhisattva on white elephant touching her side. The Buddhist tradition is that the Bodhisattva decided to incarnate himself in Buddha, manifesting on Earth for the last time. Buddhists don’t widely regard this as reason for a virgin birth. Maya is stated to have been married to the King, Śuddhodhana, for many years, so a virgin birth is unlikely. Contrast this to Christ, who was born of a thirteen year old girl who had been raised in the temple as a virgin. Regardless, even if comparison is to be made, there are numerous differences between the two. Saying that Christ’s birth is copied from the account of Buddha without looking at the facts is intellectually dishonest.
This whole “parallel savior” nonsense is highly insulting. Insulting to Christianity, insulting to history, and insulting to the religions that are purposefully distorted to reflect the agenda of the one who is paralleling. So if and when I see it, I’m going to attack it. If you are going to compare religions, do it honestly and correctly.