So, no. The word ‘heretic’ does not apply to those born outside of the Catholic Church.
As to who goes to Heaven and who goes to Hell (another word you appear to enjoy using), Catholics leave that to God. Not you.
I believe our Pope when he speaks of God’s mercy.
There’s a word you should be more familiar with.
Are you saying I should presume God’s mercy for people who do not convert?
From the Catechism on the 1st Commandment
2092 There are two kinds of presumption. Either man presumes upon his own capacities, (hoping to be able to save himself without help from on high), or he presumes upon God’s almighty power or his mercy (hoping to obtain his forgiveness without conversion and glory without merit).
So if a heresy, such as Lutheran heresy/Baptist heresy, teaches someone that they can presume God’s mercy and still go to Heaven, should I say it is not heresy and then presume God’s mercy for the Lutheran myself?
Or should I be charitable and do what Christ wants, try my best to convert them and save their souls?
The Devil is confusing people about what mercy is. Mercy is trying to save people from Hell. IT IS NOT trying to make them feel “accepted” and avoid “offending” them.
To be merciful you have to deny yourself.
Mark 8:34
And He summoned the crowd with His disciples, and said to them, "If anyone wishes to come after Me, he must deny himself, and take up his cross and follow Me. 35"For whoever wishes to save his life will lose it, but whoever loses his life for My sake and the gospel’s will save it.…
This is from the Catechism on the first Commandment:
Faith
2087 Our moral life has its source in faith in God who reveals his love to us. St. Paul speaks of the "obedience of faith"9 as our first obligation. He shows that “ignorance of God” is the principle and explanation of all moral deviations.10 Our duty toward God is to believe in him and to bear witness to him.
2088 The first commandment requires us to nourish and protect our faith with prudence and vigilance, and to reject everything that is opposed to it. There are various ways of sinning against faith:
Voluntary doubt about the faith disregards or refuses to hold as true what God has revealed and the Church proposes for belief. Involuntary doubt refers to hesitation in believing, difficulty in overcoming objections connected with the faith, or also anxiety aroused by its obscurity. If deliberately cultivated doubt can lead to spiritual blindness.
2089 Incredulity is the neglect of revealed truth or the willful refusal to assent to it. "Heresy is the obstinate post-baptismal denial of some truth which must be believed with divine and catholic faith, or it is likewise an obstinate doubt concerning the same; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Roman Pontiff or of communion with the members of the Church subject to him."11
2090 When God reveals Himself and calls him, man cannot fully respond to the divine love by his own powers. He must hope that God will give him the capacity to love Him in return and to act in conformity with the commandments of charity. Hope is the confident expectation of divine blessing and the beatific vision of God; it is also the fear of offending God’s love and of incurring punishment.
2091 The first commandment is also concerned with sins against hope, namely, despair and presumption:
By despair, man ceases to hope for his personal salvation from God, for help in attaining it or for the forgiveness of his sins. Despair is contrary to God’s goodness, to his justice - for the Lord is faithful to his promises - and to his mercy.
2092 There are two kinds of presumption. Either man presumes upon his own capacities, (hoping to be able to save himself without help from on high), or he presumes upon God’s almighty power or his mercy (hoping to obtain his forgiveness without conversion and glory without merit).
2093 Faith in God’s love encompasses the call and the obligation to respond with sincere love to divine charity. The first commandment enjoins us to love God above everything and all creatures for him and because of him.12
2094 One can sin against God’s love in various ways:
- indifference neglects or refuses to reflect on divine charity; it fails to consider its prevenient goodness and denies its power.
- ingratitude fails or refuses to acknowledge divine charity and to return him love for love.
- lukewarmness is hesitation or negligence in responding to divine love; it can imply refusal to give oneself over to the prompting of charity.
- acedia or spiritual sloth goes so far as to refuse the joy that comes from God and to be repelled by divine goodness.
- hatred of God comes from pride. It is contrary to love of God, whose goodness it denies, and whom it presumes to curse as the one who forbids sins and inflicts punishments.
Here is a link to the Catechism on the first Commandment. I think you should read it.
vatican.va/archive/ccc_css/archive/catechism/p3s2c1a1.htm
I love you