"Without God, we would not have the same sense of right and wrong"
What's your evidence for that?
Just look at the animal kingdom. For example, predatory animals such as the alpha male lion would kill any lion cub to keep his dominance. Crocodiles do the same but not for the reason of dominance. The prey, like the Wildebeast does not have that level of cruelty, but are too afriad to rescue their own young without overwhelming numbers.
"I can say they're wrong for the reasons I already mentioned. What those people did was very harmful to countless people."
But they believed that they're doing the right thing. Without source of absolute truth, what they've done, while obviously harmful, can ultimately be neither be right or wrong. Thanos, killing half of the population, has an actual historical precedence.
When the Black Plague hit Europe, nearly half of the population have died, but it was a major contributing favor in the rise of Europe that lasted to this day, starting with the Renniassance. .Was it harmful? Clearly. But Europe became prosperous & powerful as a result, whereas before, they've never been a powerful and influential people, save only the Greeks & the Romans. They've also been constant victims of eastern nomadic peoples such as the Turkic, Hunnic, and the Mongols. They would've also experienced the fate given to Africans with the eastern & African empires such as the Philistines, the Persians, the Egyptians,
Thus, Machiavellian quote "The end justifies the means" can be seen as a moral act in itself.
"Yes, and that goes for everyone, including Christians."
While I agree, that;'s besides the point.
"I'm not convinced it has been demonstrated to be trueI have a conscience. Can you prove it came from God?"
We have yet to memory, discussed the inspiration of scripture, but I hope to do so, soon. If the Bible is inspired, then there is your evidence. But are you asking me to provide physical evidnece?
"Humans are apes, and yes, there are many organisms between modern humans and our ancestor species."
Which are often found in fragments, can be mistaken as an actual homosapien when the creature had an arthritis, or a total hoax, such a the Pitdown Man.