Mary Immaculate Conception?

see also a longer length video here: http://www.instituteofcatholicculture.org/born-without-sin-a-study-of-the-immaculate-conception/

A written debate between a Protestant and Catholic on this doctrine:https://www.patheos.com/blogs/standingonmyhead/woman-and-serpent-take-2

https://www.patheos.com/blogs/standingonmyhead/2015/12/debate-with-evangelical-on-the-immaculate-conception.html

more articles on Mary: https://www.patheos.com/blogs/standingonmyhead/holy-mary-mother-of-god