>Do you think that people are born with the innate capacity for language?
The potential for it yes, I believe is not really debated, but it's still something you have to learn.
Left to their own devices, for instance, deaf people will not create a language for themselves. They'll communicate through mime, but without someone to teach them sign language, they never develop any sort of linguistic communication. They do not reach the point where they associate symbols with objects, and give things "names".
There was a pretty wide study of this involving deaf children who grew up in developing nations with no access to sign language. There was at least one particularly interest case where a previously "languageless" individual learned sign language as an adult, and was able to describe an entirely alien thought process based on images he had before he made that breakthrough. (Try to imagine thought without language, and you'll get some idea as to how alien).
Before, he was part of a group of languageless individuals that spent much of their time together, but he broke off all social contact with them after learning sign language, saying that "he couldn't go back to that darkness".
Not that deaf people won't develop their own unique sign languages when briefly exposed to someone who can sign and teaches someone the fundamentals, as has happened a few times.
Those who grow up languageless, even in cases where there's no abuse or malnutrition involved, sometimes never pick up certain cognitive abilities, such as the "where will Sally look for her doll", or the "to the right of the blue door" tests. So it seems even certain forms of analysis are language dependant, and have to be learned at a young age.
Clearly, there must have once been some sort of fluke where an individual made this break through on his own, but generally speaking, it seems language is not instinctual, being more nurture than nature, even if there are certain universal verbal signals.