What is the definition of gheebah and what is the ruling on it?

I am a woman who corresponds with some European and American women via the internet. We have been exchanging gifts and discussing sewing ideas for two years. I have tried to talk to them about Islam, but I stopped for fear that I do not know enough to call them to Islam and I might make some mistakes. What do you advise me to do, should I cut off my ties with them altogether or should I carry on with the aim of calling them to Islam despite the difficulties? and how should I begin? Is this relationship regarded as friendship, and what is the Islamic ruling on it?

There are many religions.

Why do Muslims think that Islam is true. Is there any factual basis?

According to the Quran and/or Islamic traditions, why did God create mankind?

One of the guys at work was asking me why I became Muslim and I told him it is the path I must follow. I don’t know sometimes what I should say, for me it is the path I must follow. What can I say to someone; I don’t want to push what I believe, so how should I answer someone if asked, what is the right way to answer the questions? Sometimes I feel I don’t give the right answers... Any clues as to what I can say?

What is the ruling on fasting six days of Shawwaal? Is it waajib (obligatory)?

One of the women is saying that if a pregnant woman reads Soorat az-Zalzalah, the foetus will be miscarried because of reading this soorah. She also says that if she goes for ruqyah as prescribed in Islam, she had to tell the raaqi that she is pregnant so that he can avoid reciting Soorat az-Zalzalah over her, so that the foetus will not be miscarried. Is this true? May Allah reward you with the best of rewards and benefit the ummah by means of you.

What is sincerity, and what are the benefits of sincerity?

Is it permissible for me to say to non-Muslims "And the same to you" when they wish me a Happy New Year or say Best Wishes?