What Catholic (ROMAN Catholic) Beliefs Are "Optional"?

[georges641]

A school of thought seems to pervade this group that certain doctrine may be rejected, based on conscience, and therefore, even though the Church may say certain things are sins, they are no longer sins if the Catholic rejects the teaching.

I have some specifics I would like to have addressed, pertaining to sin in this first post. To simplify the responses, please answer with "Never," "Always," or "It Depends," and if the last one, then please elaborate.

(Note that by "sin" I mean a "serious sin&quot

Is it a sin for a woman to have an abortion?

Is it a sin to perform abortions?

Is it a sin to commit adultery?

Is fornication a sin?

Is homosexual sexual activity a sin?

Is it a sin for a homosexual to have concurrent multiple sex partners?

Is it a sin for a homosexual to have uncommitted sexual relations?

Is it a sin for a bisexual married man to have a homosexual partner in addition to his wife?

Is it a sin to watch pornographic movies?

Is it a sin to produce pornographic movies?

Is masturbation a sin?

Is the use of contraceptive devices a sin?

Is the use of contraceptive devices or chemicals that are abortifacients a sin?

Is it a sin to willfully skip going to Mass on Sunday and Holy Days of Obligation?

If a Catholic does not agree with your dissent and adheres to what is to you an objectionable Church teaching about sin, does he sin?

Is it a sin to believe everything the Church teaches about sin?