No one here is guaranteed Jannah, as brother Ansar has pointed out. The Second Caliph, Ameer al-Mu'mineen Umar Ibn Al-Khattab (ra) in his final stages was lying on the lap of his son Abdullah (ra), Umar (ra) said to him 'My son place my head on the floor', Abdullah (ra) crying asked him 'Why my father?' and the words from Umar where 'If Umar is destined for Jannah then know that the pillows of Jannah are softer than your thighs and if Umar is destined for Jahanam then know that you dont want a Jahanami in your thighs'.
If this is the state and humbleness of a great man like Umar (ra), a man who the Prophet (SAW) said if there was to come after me a Prophet it would be Umar (ra), then surely it is something we should follow and not decide where we all end up, only Allah (SWT) can judge.
We should all have a care for humanity and call them to the right path and pray that Allah (SWT) opens up the hearts of all mankind, if the Nabi Muhammad (SAW) can pray for guidance and forgivness for enemies then who are we not too. His (SAW) heart was so soft and merciful, and the people who are living now are part of his ummah and he is their Prophet sent to them, not just the muslims, we all know he (SAW) would weep for his ummah. May Allah (SWT) guide humanity to the truth, ameen and eminate in all our hearts humbleness and emaan inshallah.