Metaphysics is a branch of philosophy. It simple means a study of the nature of the universe on the fundamental level.
It is possible for existence to be finite and eternal. It exists for as long as time does and time exists so long as there is existence. We can’t even ask what was here before anything was here. What evidence is there that the universe had a beginning? Who says that the big bang was THE beginning?
According to your argument, then god had to have a cause. If everything that exists has a cause or a beginning then if a God exists then it had to have a beginning. But the article points out that that would lead to an infinite regression which is the logical problem with the first cause argument. So if a god can exist with no beginning then so can existence.
I believe that existence is an axiom. It is an irreducible primary. It is an absolute and needs no cause. No one knows where it came from and I mean no one. Many people accept an explanation on faith. To me faith is not a good foundation for knowledge. I don’t need faith to know that existence exists. It is self evident. So that is my starting point of knowledge and I go from there and just because we don’t have answers to every question does not mean we get to fill in with speculation and call it knowledge. Scientists speculate for the purpose of coming up with an explanation then they go on to look for evidence. They ask: Does this speculation (hypothesis) correspond to reality. Once again reality, existence, is the means of validation. For a rational person, it is the only means of validation. Existence itself needs none.
“According to your argument, then god had to have a cause. If everything that exists has a cause or a beginning then if a God exists then it had to have a beginning”
Incorrect. Everything that exists under the laws of our universe has a cause. The law does not apply to things that transcend the universe, such as numbers and other mathematical constructs. These things we understand to be eternal, because they transcend the universe.
God is understood to transcend the universe.
Speculation implies that we pluck an answer out of thin air. On the contrary, we can analyze what we do know, similar to how historians piece together fragments to build an accurate picture of the past. I think the fine-tuning alone allows us to make the logical assumption of intelligent design. If you came across a fully functioning plane in a forest, you would not conclude that such a masterfully engineered object could have just come together by chance. You would apprehend that planning went into building it. Looking at how carefully balanced our existence in this universe is, I find God to be far more likely than no God.