Does 1 John 5:7 Belong in the Bible?

1 John 5:7. Some claim it was added later, that it’s missing from early Greek manuscripts, and that we shouldn’t use it to defend the Trinity. But is that really true?

Sources
http://www.marvinmckenzie.org
https://marvinmckenzie.substack.com/
https://www.amazon.com/stores/Marvin-McKenzie/author/B005OZV81Q?
https://www.smashwords.com/profile/view/MarvinMcKenzie
https://medium.com/@booksbymarvinmckenzie
https://macz.creator-spring.com/
https://ko-fi.com/marvinmckenzie14276
https://www.youtube.com/@MarvinMcKenzie
https://www.youtube.com/@ApologeticsAdvocates
https://www.youtube.com/@MarvinMcKenziePreacher
https://www.youtube.com/@LegendsofLiberty