Q. 1. I heard there are sins against the virtue of faith. What are those sins?
A. 1. Sins against the virtue of faith are:
• Apostasy. - This is when a Catholic completely leaves his faith to profess a non-Christian religion or none at all.
• Heresy. - This is the belief of the heretic who opposes the divinely revealed teaching of the Catholic Church. In other words, a heretic is one who persistently denies a Catholic doctrine in spite of reason and an explanation of the teaching.
• Indifferentism. - This is the belief that one religion is as good as another. In other words, the Catholic faith is equal to the Anglican or Lutheran faith. This rejects the truth that the Catholic Church is the Mother Church. The other churches (denominations) are sister churches to each other, excluding the Catholic Church.
• Identifying oneself with other religions. This is when a Catholic claims to have become a Protestant or embraced other beliefs such as the Jehovah Witnesses, etc...