will non Muslims, like the christians and the jews and others who dont believe that the Prophet (SAW) is the last messenger go to Jannah?

The fundamental requirement to enter into Jannat is accepting the Oneness of
Allah and finality of the Prophethood of Rasulullah (Sallallaahu Alayhi
Wasallam). Non-Muslims will be rewarded in this world for their good deeds
or alternatively the punishment in the hereafter will be decreased for them
as will be the case with the Uncle of Rasulullah, Abu Talib, who protected
him as safeguarded Rasulullah (Sallallaahu Alayhi Wasallam) from the harms
of the disbelievers.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai