Essentially children will know when they need to use the toilet, they will know how to physically get up and walk to the toilet, they will know how to use the toilet, and they will know the consequences of not going to the toilet when they need to - however they are missing the part that turns thought of 'I need the toilet' into action of getting up to go to the toilet. With Autism the autistic person is very much in their own mind and there is a disconnect between their world in their mind and how they interact with the physical world around them - it's difficult to find a way of bridging that gap.
There is no specific percentage of autistic people who wear diapers as it can vary depending on individual needs and circumstances. Some autistic individuals may wear diapers due to sensory issues or difficulties with toileting independence, while others may not require them at all. It is best to approach each person's needs on a case-by-case basis.
No - autism is a neurological condition, autistic children grow-up into autistic adults.
No, not all Autistic children are savants. Many Savants are Autistic, but most Autistic people are as normal as Neurotypical people with no particularly special talents.
Some are, but eatind disorders do tend to affect autistic children a little bit less (statistically speaking) that non-autistic children. Some believe this is because they are less influenced by society around them.
No, Autistic children are not damaged so they do not need to be healed. Marijuana can help with Autism symptoms such as anxiety, but equally in some Autistic children it can make problems worse.
Yes, autistic children can be taught in mainstream schools. Most autistic children are likely to be mainstreamed, one reason being that autistic children thrive in mainstream school when they're allowed to learn and interact with their neurotypical peers. Often in special education autistic children aren't challenged enough, this is true in mainstream schools too but worse in special education.
Feral children may act similar to severally autistic children, but the conditions are different. Autism is caused by genetics, feralism is caused by extreme neglect, so feral children are technically not autistic, though I've seen theories that say only autistic children are capable of figuring out on how to live in the wild, and therefor all feral would be autistic.
No, autistic people are not 'crazy'. Many autistic people can have mental health issues but they're no more likely to have mental health issues than anyone else and often mental health issues in autistic people is more to do with how society treats autistic people - e.g. depression is more likely in autistic people who are bullied or face discrimination.
Autistic children can do many things that other children whom are not autistic do on a daily basis. I advise showing him/her how to do it safely and be patient with the child. Good luck!
The parents of autistic children really have their work cut out for them.
No.
Autistic children DO feel pain.