Heretics means to have a very strong belief and and some people that have a faith may not be true to that faith meaning for an example if you are Catholic and you are true to that belief and you safe yourself on till marriage and also how most Catholic belief that you should not divorce and you follow that, then you could consider that as heresy. So what I'm saying is it depends on how strong your belief is.
Sorry if I made no sense I tried to be as direct as I could Hopefully Helped you :]
