Zaman Hi,
My partner and I are bring up our AS son (4 and a half) as bilingual. My other half is French. Our son, Louis, has a severe language delay. He only started speaking at all at 4 years and at 4 and a half has only just started making requests with words following quite intensive Verbal Behaviour therapy.
Like you, our decision to persist with a bilingual lifestyle for him was not always looked on favourably by medical people involved in his care. I have to admit I sometimes wonder whether we are doing the right thing myself, but I think it is really important that his father communicate with him in his "natural" language, and I know that, in spite of his language delay, Louis does understand much of what is said to him in both languages.
I agree with you very strongly that language is a huge part of cultural identity and that our children should not be deprived of their cultural heritage. At the end of the day, I believe our son will be glad that we chose to bring him up bilingual.
MelG