Neither would there be literally hundreds of different denominations of Christianity which exist because they can't agree on what The Bible actually says. Catholicism, Protestants, Baptist, Lutherans, Eastern Orthodox, Greek Orthodox, Anglican, Pentacostal, Latter Day Saints, Methodist, Jehovah's Witness, Unitarians. The list of one true interpretations goes on and on. All of these different denominations of the Christian faith exist largely because they have interpreted The Bible differently.
Some believe The Bible is a historically accurate depiction of events, others believe it's a collection of stories with moral guidance. Some believe the Virgin Mary should be worshipped., others consider this idolatry. Some believe hell is a place of fiery torture, others describe it as being nothing.
To say someone doesn't know much about The Bible and suggest that they're objectively wrong when there are so many interpretations is ridiculous. If Swift has missed the mark, there has to be a mark to miss, but Christianity seems to be all over the maps.