Yes. Since the games are build into the Steam platform, you will lose them. Although, If you purchased a game, you can get if again for free if you Reinstall it.
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not at all of u delete/uninstall steam it will still be there but if u delete ur account then it will be deleted but it is ok to deleate steam it will be there
Yes you can, you import and add non-steam games to your Steam library. From within the library you can launch and run any games, although 'Steam achievements' will only be available for Steam enabled games.
Yes, some. Not all of them can be activated on Steam. See the related links for a list of the games that can be activated on Steam and for the instructions on how to activate a game on Steam.
You can't.
No, but there is a steam function to add non steam games on to your library.