The Universe, rather than fine-tuned, is a bit of a Heath-Robinson machine. If any part of it works, it is more by accident than design. Let's face it, who in their right mind would deliberately design a Platypus?

It is oerfectly possible to imagine or think of something that doen't exist. People have ebb thinking of the 'perfect this' and the 'perfect thst' for millennia, but no perfect thing exists. The ontological argument is one of the sillier ones.

All moral values are subjective. The fact that codes have been handed down by different cultures for many ages, and have been found to have some similarities, prove nothing but our common ancestry and the fact that there are only so many ways to organise a community.

As for 'nothing comes from nothing', very sensible. Our current Universe came out iof the singularity which was the end of the previous Universe in the same way that the next Universe will arise from the remains of this one.