the answers to a good life are set out below
Shelly , What if i tell u these rules also apply in islam, so after all there is some common ground we can start the discussion from.
About killing ur patner, Well the prophet said killing a muslim is diselief (i.e getting out of the fold of islam) .
As regarding non muslims its in the quran :
Allâh does not forbid you to deal justly and kindly with those who fought not against you on account of religion and did not drive you out of your homes. Verily, Allâh loves those who deal with equity.
Say (O Muhammad ) to the believers to forgive those who (harm them and) hope not for the Days of Allâh (i.e. His Recompense), that He may recompense people according to what they have earned (i.e. to punish these disbelievers, who harm the believers).
If the Muslims should kill non muslims then there would not have been any non muslim living peacfully in islamic countries.
Cubic , The lord is all merciful, how would he tell us to kill each other ??
Listen to this
And (remember) when your Lord said to the angels: "Verily, I am going to place (mankind) generations after generations on earth." They said: "Will You place therein those who will make mischief therein and shed blood, - while we glorify You with praises and thanks (Exalted be You above all that they associate with You as partners) and sanctify You." He (Allâh) said: "I know that which you do not know."
In the story of the two sons of Adam [Hâbil (Abel) and Qâbil (Cain)]
Because of that We ordained for the Children of Israel that if anyone killed a person not in retaliation of murder, or (and) to spread mischief in the land - it would be as if he killed all mankind, and if anyone saved a life, it would be as if he saved the life of all mankind. And indeed, there came to them Our Messengers with clear proofs, evidences, and signs, even then after that many of them continued to exceed the limits (e.g. by doing oppression unjustly and exceeding beyond the limits set by Allâh by committing the major sins) in the land!.