I believe in the Immaculate Conception and the Assumption of Mary because the Catholic Church teaches them.
The Immaculate Conception and the Assumption do not contradict anything in Scripture, and are reasonable doctrines in themselves.
The catholic church also instigated the Inquisition. You believe in the killing of people who disagreed with Rome? The rcc was advocating that also.
You believe indulgences should be sold? The rcc taught that.
You believe everyone has to be subject to the pope and do what he says?
You believe you can lose your salvation? The bible notes if you can lose it, you can't get it back. Are you sure you believe this? The rcc teaches this also.
I leave you with this from your own catholic apologists.
No direct or categorical and stringent proof of the dogma can be brought forward from Scripture.
It is necessary to distinguish between dogmas that have been solemnly and formally defined by the Church, and actions taken by someone here or someone there who happened to be Catholic.
The notion of “once-saved-always-saved” has to be among the top five moronic beliefs concocted in the last 200 years. It flies in the face of reason, and it is not taught anywhere in Scripture. Intellectually and morally, it is a low point in the history of the maimed, deformed, crackpot versions of Christianity that have been loosed on the world by Satan since the Reformation.