Possible yes. Probable, no. There are a plethora of different views on moral issues that are universal, let alone subjective.
How can you justify that it's not probable? The evolutionary/biological evidence points to this explanation (subjective), where there is no evidence at all for your view (objective).
Based on the available evidence, a subjective basis for morality is far more likely to exist.
I never said that Mr. Ellis. I have said there are basic beliefs about morality that are binding upon all and are accepted regardless of culture, location, time etc.
How do you know those basic moral beliefs are binding?
This knowledge comes from the logical deduction which states: either there is a God (some supernatural, omnipotent, omniscient, moral being) or there isn't. One is true. Both cannot be true and both cannot be false. We know this because scientist have come to the conclusion that the universe had a definite beginning at some point in the distant past. In other words, the universe was created ex nihilo. Now, if the universe came to be at some point in the distant past, then logically it stands that there was a cause for it coming into being. This cause must meet the above qualifications. This outside source as you call it is more plausibly God.
How can you possibly name God as the most plausible source? There's no evidence to show the existence of God is even plausible, much less him being the source of all morality.
A proposal without evidence can not be the most plausible under any circumstance. There's nothing there to make it the least bit plausible.
You are correct atheism is not a system of morality. It is a system of amorality.
No, Atheism is not a system of anything. It's a position taken on the existence or non-existence of God.
This is incorrect. Theism states that all that exists, whether immaterial or material, has it's source in God. This includes morality.
No, Theism does not state that. A theist simply believes a God or Deity exists, that's all. Any attributes you give to that God are separate from your position on whether that God exists or not.
This is to confuse terms. A person can be moral and not believe in God. All this means is that they are living in a contradictory manner to their belief.
No, not in the least. This is simply an incorrect statement. My belief is that morals come from within us.... that's not contradictory with not believing in a God. God is irrelevant.
You are saying it is never permissable to rape someone. I agree. This is a statement on morality once again. As an atheist, you have no ground to make such an assertion.
I thought you were interested in carrying on a civil conversation. Statements like that are inflammatory. Frankly, stating that Atheists have no sense or justification for holding moral values is ignorant and bigoted.
I have every right to make the assertion that Rape is wrong. Just because I don't believe in your mythology, that does not change my moral structure.
Another statement with regards to morality.
Yes it is, and Secular Morality is indeed superior to Christian Morality.
The scientific method and science assumes certain things that cannot be scientifically and empirically verified. I can give you a list if you would like.
Anything that is not observable can not be investigated by science, as we can't experiment or test it. However, in regards to anything that is not observable, we also have no justification to assert it exists as we can not prove it.
Things like Philosophy also fall mostly outside the realm of science, as they deal with totally different subjects.
Have I missed anything off your list?