I am not attacking the faith or even recommending it. I think Christianity is a beautiful religion. If she wants to convince her parents of the beauty of Islam, she must show the drawbacks of Christianity. Otherwise, her parents will remain convinced that Islam is a religion of terrorists. All I'm suggesting is some research into what we consider the bid'a innovations in Christianity.
For example, just a week back, I was reading ******************** . A lot of questions regarding the four Madhabs popped into my mind, and I began to ask my mother about them. She got angry that I was reading from Shi'a sources. The I pointed out that the sources they've quoted are Sunni. That quietened her down. I did not end up becoming Shi'a, I rather hate sectarianism, but I have accepted a few views here and there.
Of course, getting into such details is not necessary, I know, I like going into such minor details. Thirst for knowledge.
What I'm merely suggesting is that sister should first point out a few controvertial verses here and there to her parents, along with a comparision to pagan rites, so that they understand why she has left Catholicism. Then, she may show the beauty of Islam.
After all, it's all fact. It's all history and religion.
