Every system of cosmology invents something, "tells a lie" as you say. These are called premises. If we are nothing but physical beings originating by chance in a random universe, then really there is no ultimate purpose in our lives. Individually you may or may not overcome this, but it undermines the moral underpinnings of society and civilization.
So what you meant earlier about finding meaning in your own life leading to nihilism is that you yourself think nihilism is an inescapable conclusion. If you think humans originated by chance, you haven't been paying attention. If you think our universe is random, you haven't been paying attention. We exist in a stable universe
because it is stable. Life exists within this stable universe
because life is stable. Saying that we originated by chance in a random universe is like saying that stability just happens to exist in a stable universe.
Morality has nothing to do with meaning. The meaning of your life does not determine your morality. You may find it impossible to have a meaningful life without morality, but that does not mean that morality informs your meaning. Similarly, you may find it impossible to have a meaningful life without food, but that doesn't mean that food informs your meaning. It might be a necessary condition, but it's likely not a sufficient one.
The closest I can come to identifying people I know who take meaning from being moral are religious zealots - whose external life meaning is intertwined with complying with an external moral system. But even then, I think few religious people are content with their lives simply because they lived them in compliance with the laws written in their holy book.
You're caught a bit in a circular loop of reasoning and you don't see a way out. You've presupposed without realizing it that meaning must come externally. When you allow yourself to conclude that there is no external entity to provide this meaning to you, you conclude that meaning does not exist. Your flaw is in your premise. The universe does not care what you do, and there is no god to care. This does not leave you with a life of no meaning, it leaves you with no
external source of meaning. Which is as it always was.
If you can't come up with a
personal reason for existence, then nihilism may result. But that is as it always was.
I'm looking at a theory which is completely consistent with everything so far discovered, including the Big Bang, a 4.6 billion year old Earth, and evolution. The only difference with standard cosmology is the preexistence of an infinite conscious intelligence. You cannot get away from the preexistence of something, whether an ensemble of physical laws generating infinite random universes or an infinite conscious intelligence. Science cannot resolve this. One view is not more rational than the other.
I think you've shifted your goalpost here. An infinite conscious intelligence... full stop... is not god, it's certainly not the god of any holy book, and it's not a god whose mind you can know, or who cares about your existence, or who can provide you meaning. You want to take this step beyond what we have evidence to support and presuppose something that you do not need to presuppose, an intelligence, and you want to do that to solve a problem, meaning, but it's not solving that problem. You need to take many many more steps further and further into what you do not have a reason to believe before you could arrive at a god that you can have a relationship with and which can provide you meaning.
Your cosmic intelligence does not solve your problem any better than a cosmic lack of intelligence.