Your quotes are from Paul in Titus 3 and are out of context.
You wrote:
"A man that is a heretic, after the first and second admonition, avoid: Knowing that he, that is such an one, is subverted, and sinneth, being condemned by his own judgment.
Paul wrote:
9But avoid stupid controversies, genealogies, dissensions, and quarrels about the law, for they are unprofitable and worthless. 10After a first and second admonition, have nothing more to do with anyone who causes divisions, 11since you know that such a person is perverted and sinful, being self-condemned.
This is about legalism which is prevalent amongst immature unfruitful Christians who are in error.
Here is the whole chapter of the letter for you to read in context:
Titus 3
3Remind them to be subject to rulers and authorities, to be obedient, to be ready for every good work, 2to speak evil of no one, to avoid quarrelling, to be gentle, and to show every courtesy to everyone. 3For we ourselves were once foolish, disobedient, led astray, slaves to various passions and pleasures, passing our days in malice and envy, despicable, hating one another. 4But when the goodness and loving-kindness of God our Saviour appeared, 5he saved us, not because of any works of righteousness that we had done, but according to his mercy, through the water* of rebirth and renewal by the Holy Spirit. 6This Spirit he poured out on us richly through Jesus Christ our Saviour, 7so that, having been justified by his grace, we might become heirs according to the hope of eternal life. 8The saying is sure.
I desire that you insist on these things, so that those who have come to believe in God may be careful to devote themselves to good works; these things are excellent and profitable to everyone. 9But avoid stupid controversies, genealogies, dissensions, and quarrels about the law, for they are unprofitable and worthless. 10After a first and second admonition, have nothing more to do with anyone who causes divisions, 11since you know that such a person is perverted and sinful, being self-condemned.
12 When I send Artemas to you, or Tychicus, do your best to come to me at Nicopolis, for I have decided to spend the winter there. 13Make every effort to send Zenas the lawyer and Apollos on their way, and see that they lack nothing. 14And let people learn to devote themselves to good works in order to meet urgent needs, so that they may not be unproductive.
15 All who are with me send greetings to you. Greet those who love us in the faith.
Grace be with all of you.*
NO they are not! You seem to be forgetting the original intent of your response which was, "Those who promote docritinal divisions and diviseness Paul called immature Christians..."
Heretics promote doctrinal divisions. Schismatics promote divisiveness.