A world without guns is pure fantasy.
The world has been and always will be shaped by the strongest weapons (a club, a spear, a bow, a knight, a cannon, a rifle, a tank, etc.). The most technically proficient cultures throughout history have stomped the shit out of the other cultures (eg: Egypt>chariot, Greece>phalanx, Rome>legionnaire, Mongols>mounted archer, western european nations>knight, England>ship of the line, Germany>blitzkrieg, Japan>aircraft carrier, US>industrial might). Until other cultures could duplicate their advance and/or tactics they got their asses kicked.
Single-man portable guns were the first item adopted that could truly act as an equalizer against armored knights. It gave a relatively untrained man the ability to kill a highly trained and armored knight at a cost effective rate. Equipping and training 50 gunners was done in about 1/10th the time and money of equipping and training 10 knights. Plus, you could use peasants as the expendable gunners----so you didnt have to pay them as you would the upper class knights and men-at-arms of the day. Medieval armies began equipping pikemen with guns slowly at first, but as steel development leapfrogged they were able to manufacture more effective guns until the gun's power and reliability made a knight no longer worth the cost.
In other words, the gun is only the latest development to make the individual soldier more powerful.
If guns weren't adopted/invented we'd still be armed with something-----
OR...we'd all still be fuckin serfs. Amen. And yes, I'm hammered.