Heresy Is The Sin of Sins

Are you saying "no" to the Church in any way, large or small? Do you mock or have pride concerning a teaching of the Church? Are you totally faithful to the Magisterium?

If not, you are in rebellion and unorthodox, and your immortal soul is in danger.

If you are not a devout, orthodox, obedient Catholic, you cannot commit the big sins. But, if you depart from Church teaching in ANY way, then you will be open to great temptation and mortal sin.

Think about this.

Here is the Merriam-Webster definition:

her·e·sy

 noun \ˈher-ə-sē, ˈhe-rə-\

: a belief or opinion that does not agree with the official belief or opinion of a particular religion

plural her·e·sies

Full Definition of HERESY

1

a :  adherence to a religious opinion contrary to church dogma

b :  denial of a revealed truth by a baptized member of the Roman Catholic Church

c :  an opinion or doctrine contrary to church dogma

2

a :  dissent or deviation from a dominant theory, opinion, or practice

b :  an opinion, doctrine, or practice contrary to the truth or to generally accepted beliefs or standards