I've got it! And as I read thru the thread, I realize that two or more participants got it before me.
I worked thru the ethics of this situation. Many of you said that granddaughter was right because Christians are urged to preach to the world. Even my husband said that: his father was a fundamentalist preacher long ago. (His father had good manners, however, and didn't carry on in this cult way.)
BUT --- The Thugees of India are known to be supposed to kill at least three travellers a year and rob them. That was their religion.
Muslims are well known now to be told in the Koran to stay in Jihad against us all their lives; to kill all apostates (like Obama, who was raised Muslim and is certainly up for being murdered as an apostate), to war forever against infidels, meaning you and me.
If their holy books they have to obey such terrible instructions that we don't think valid, then the same is true of the New Testament, which enjoins Christians to make themselves a total nuisance and disliked by all their family and friends, as long as they have any, which is unlikely to be long if they constantly buttonhole people with preaching, after people tell them to stop that.
Mormons' holy book says they have to marry many wives (so they can reproduce enough to take over the world), but did anyone ask the women of the world if they want that? Apparently Mormon churchmen didn't care what women thought. Every man is supposed to marry at least seven women, one for every day of the week. The Federal Government officially stopped all this terrible polygamy in 1892, though it never really stopped, as the horrible abuse trials of the criminal men who continue to do that show.
So that's the problem: Holy Books all over the world give AWFUL commandments to their faithful, to behave frankly badly, often murderously. So these books are wrong, wrong, and immoral, and no one should do the bad things they command: they all just want their religion to take over the world, that's the whole point. That's why the New Testament tries to get everyone to preach to the heathen.
Well, they need to stop that. Right now. It's completely unacceptable behavior and I'm not having another word of it.