I have read the Bible so thoroughly and made so many notes in the last 40 years that two of my bibles have totally disintegrated. I have found no mention in the Bible about Mary being taken to heaven. You need to read the Bible more.
It was decided somewhere in the 1950s by the then Pope that Mary was in fact taken to heaven with body and soul.
There are many such things which The Roman Catholic Church would like us to believe which are termed as Holy Mysteries because they cannot be logical truths.
For that matter something like Jesus having brothers and sisters is denied by The Catholic Church when the Holy Bible clearly states that He did have brothers and sisters.
The greatest sins which Catholics and some ignorant Christians are committing are idol worship, saint worship and repetitive prayers all of which is forbidden in The Bible.