What specific Western ideas come from either the Bible or Christian tradition?
Slavery abolition absolutely does not count because slavery was allowed in the Bible and practiced during the Catholic Middle Ages. The abolition movement grew out of the Enlightenment while slavery was still being practiced and justified by Christianity.
The most I'll grant you is that Christianity influenced Western art, no question. What I'm saying is that Christianity had an extremely minimal influence on our laws and politics. Those came from the Enlightenment with roots in Ancient Athens. I understand you acknowledged the West has its roots in Greece, but you're incorrect in saying Western Civilization is based on Christianity, other than when it comes to art.
Reputable historians almost universally disagree with you.
The burden is on you to prove the history of Western civilization is not influenced in a significant way by christianty.
Since your assertion flies in the face of scholarly historcal consensus, it is on you to prove your claims