Welcome! Your English is excellent, don't worry on that count.

...also, that's a really tough predicament (hiding your atheism from your fundamentalist family), and I don't have anything wise to say about it, except that it isn't the end of the world when they do find out, and that often people will break their religious commitments rather than really abandon their children (so long as they can think of a religiously acceptable excuse to do so). But I'm not really qualified to give that advice. Hang in there!