One the other hand, I know for certain, that even with God there is no objective moral truth that anyone might agree on for sure.
Even if that were true you would have no idea what so ever about it because you have no access to it. Objective means true and binding even if no one agrees with it. It seems some definitions are in order.
In this context.
1. Objective morality - Are values and duties that are binding and true even if no one believes them or even knows about them. They knew the difference between morality and ethics 3000 years ago, why haven't you kept up?
Malum in se (plural mala in
se) is a Latin phrase
meaning wrong or evil in itself. The phrase is used to refer to conduct assessed as sinful or inherently wrong by nature, independent of regulations governing the conduct. It is distinguished from
malum prohibitum, which is wrong only because it is prohibited.
Malum in se - Wikipedia
This is morality and only exists if God does.
2. Subjective morality - Are values and duties that humans make up based on might, opinion, and preference (being subject to them) which do not correspond to any objective moral truths because without God they cannot exist.
Malum prohibitum (plural mala
prohibita, literal translation: "wrong [as or because] prohibited") is a Latin phrase used in law to refer to conduct that constitutes an unlawful act only by virtue of statute, as opposed to conduct that is evil in and of itself, or
malum in se.
Malum prohibitum - Wikipedia
This is ethics and it can exist without God. Actually it can't but in order to have a discussion I will pretend it can.
3. Epistemology - Concerns how we come to know about a thing.
4. Ontology - Concerns the nature of a thing.
Please keep these in mind when you post.