If there was an objective meaning of life. Beliefs can be consistent but not coherent. That doesn’t make them false. However, the belief that the universe started by a quantum fluctuation that inflated into the universe is consistent with known facts, and it may or may not be coherent, but you would have to make that case. In this cosmology I would ask, “Who is doing the observing that caused the quantum to come into existence before it inflated into a universe?”
Another possibility: the universe was caused by a 4-dimensional black hole. The burden would have to be on the person making this claim to argue that this is a reasonable position.
Rank Amateur feels the cosmological argument is a good argument. S does not. Now, S should give an argument why one of the premises of this argument is false, or why the conclusion doesn’t follow. That’s how you critique arguments.
Personally, I think Rank Amateur is the more noble of you two, not because I agree with him (because I would have to hear the argument and counter-argument before I would decide, and I have my own reasons for my beliefs), but because he is brave enough to put forth a claim.