Well, I don't know if G-d heals. I'm not real crazy about this so-called "gift" of autism that he or she has bestowed upon my family, but whatever. Some individuals believe "things happen for a reason" and if you are one who gets comfort from that, more power to you. Based on my experiences in life, I believe simply that "things happen".
I speak from personal experience as a parent of a four-year-old girl with autism. I am not giving you advice based upon theory, junk science, some celebrity, Dr. Phil, (at the behest of my mother, I watched a rerun where he counseled a family of a boy with Down syndrome and autism. Now there's a night of lost sleep I'll never get back. Oh, and his website was also totally useless for autism resources) my relative, my neighbor, or a service I'm selling. Special-needs mama to mama: if you keep working with your child in a comprehensive manner, he WILL make great strides. If you're anything like me, you want a crystal ball to predict your kid's future and you have great moments of despair. For me, this is a breeding ground for vulnerability so I am very careful about where I seek my solutions.
There's a saying in the autism community: if you've met one person with autism, you've met one person with autism. It's not like other developmental disorders - for example, with Down syndrome it's pretty clear what techniques work and how much growth can be expected. With autism, however, what works for your kid may not work for mine and vice versa. Some children eventually test off of the spectrum, many are mainstreamed in public schools and grow up to live independent lives. My daughter's progress is like a game of Whack-a-Mole. Just when we think she's mastered something, an old or new issue pops back up - you know, like what happens with typically developing kids.
My experience with treating my daughter's autism has been to leave no stone unturned. We try and we fail and occasionally something sticks to the wall when I throw it...then we go back and re-evaluate. For example, the gluten- and dairy-free diet - not a miracle worker, but my kid doesn't flap her hands and she is more focused when she's on it. Educate yourself as much as possible, so you can advocate on his behalf and also carry out techniques at home. Join support groups with POSITIVE parents and lecturers. Find therapists and teachers who BELIEVE in your son as much as you do. If anyone imposes limits on what he may be able to do someday, find another placement or referral.
You get the idea.
Sorry for the long winded feedback but obviously this is an issue close to my heart:) Good luck and many blessings to you and your family.