What will happen if i restore my iphone 4 with redsn0w?

I currently updated the ios to 7.0 and it is so slow that i can't resist
my iphone is not jailbreaken
its original
i heard about restoring from itunes has stop
i heard redsnow software restore it
does restoring with redsnow make my iphone jailbroke
i don't want jailbroken iphone
i want og iphone 4 with ios 6.1.3
is this safe because in video i see they select some option of blob which only jailbroken has
does this mean i can't downgrade?

If you're an iPhone 4, iPhone 3GS or iPod touch 4G user and accidentally upgraded to iOS 6.1.3 then the good news is that it is still possible to jailbreak your iOS device using Redsn0w.
RedSn0w is a jailbreak tool developed by the Dev-Team.

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