Google didn't create Android, they backed it and later bought it. The original developers thought users were too dumb to use Linux, so they dumbed it down by stripping the security out of it to make it user friendly.
I don't really understand how this is 'true'. Linux security doesn't isolate process disk data from each other, anybody can read any part of the disk under the same user, which in practice is all apps a user use because they all run under the user's account. Android has a far *better* security model in this respect because it puts different applications in different users, so they can't get at each other. Also, permissions for system information is far more granular in Android than plain Linux, in Linux you just look at /proc whereas Android has to actually get types of permissions for sensitive data.