"yeah drowning a puppy harms a living being. so does abortion"
Abortion terminates a pregnancy. An embryo doesn't have human rights. And no one has the right to use someone else's body without their permission.
"who are you to say harming a living being is wrong"
That's part of the foundation of my morality, and for many other people's as well. What do you base your morality on, then?
"I'm not talking about chemical truth. I'm talking about the fact that with a Christian worldview, I can know what is right and wrong bc the Holy Spirit guides me"
There's only truth, there's no such thing as "chemical truth". You say the Holy Spirit guides you. How do you know? How can you prove that's true?
"without that, there's literally no such thing as morality"
Yes, there literally is. Morality doesn't stop existing if a god isn't real.
"this country was founded with a Christian worldview. and it worked out just fine until we drifted away"
Worked out "just fine"? So slaughtering native Americans and keeping Africans as pieces of property is fine with you?
"empathy? where does empathy come from?"
It most likely evolved to help us survive. We are more likely to survive as a group if we treat each other well and get along.
"I mean if we're really just descendants of algae, then it would seem that we wouldn't have empathy"
That's a strawman, and a complete misunderstanding of evolution.
"survival of the fittest right?"
You clearly don't know what that term even means
" "Maybe neither one of us is," tells me that you indeed have no absolute truth, therefore you're in no position to tell me that I'm wrong"
I don't have to have absolute truth to say that something is right or wrong. That's like saying "you can't say that George Washington was the first president because you don't have absolute knowledge of all world history."
"I, on the other hand, do have absolute, everlasting, and perfect truth through God"
Cool. Can you prove that?
"so don't say empathy, cuz you can't tell me where it comes from"
I don't have to know where empathy comes from to know that most humans have it. I'm assuming you wear clothes, even though you don't know who assembled those clothes in the factory.