Oh boy do I have a lot to say about all of this.
First of all: I'm most of all a scientist. That means I accept what can be proven.
Yes, most of those proofs are "just" scientific theories, but that's the beauty of science: always selfimproving.
So, if people can prove that god(s) exist: cool, I'm all for it. And would be interesting.
If, however, it's proven they don't exist, I'd prefer if people would stop talking about them. Unless referred to as sci-fi/fantasy.
However, if god(s) do exist, I honestly don't believe they're nice people. Nor that they're omnipotent.
A nice little quote I like, attributed to the Greek philosopher Epicurus:
"Is God willing to prevent evil, but not able?
Then he is not omnipotent.
Is he able, but not willing?
Then he is malevolent.
Is he both able and willing?
Then whence cometh evil?
Is he neither able nor willing?
Then why call him God?"
Though it's not 100% that he was the one who said it.
Anyhoo, the Buddhist gods are, funnily enough, what I'd most associate with gods (if they exist).
Just very very powerful beings.
And in Buddhism, at least from what I can remember, they're really just people who have gained so much good karma, that they reincarnated as a god. Which funnily enough according to Buddhism means they are at the top of the Karma wheel so to speak, and it can only go downhill from there on. They were so good in their last live, that it can only go downhill from now on. Meaning when you're a god, you can't really do any better, just screw up (intentionally or not), and get reincarnated as something lower later on.
Anyhoo, back to Jesus. From what I can recall from what I've read, the Romans kept records of who they crucified, and yes, they crucified someone named Jesus, meaning at least someone by that name existed. Everything else about him and the bible is in my opinion either bollocks or just irrelevant.
If you need an imaginary hell you might end up in to be a good person, if you need a "holy" scripture to be good, well, honestly you have larger issues. Like a lack of empathy.
Something as simple as caring about others should come naturally, not be forced by books or any potential "evil" that might happen.
In regards to evil and good: I totally agree that they're human constructs!
Just like good and bad. It doesn't really exist. What exist is actions and consequences (or reactions)
Call it frequencies if you want to. Or harmonics. Or karma. Or whatever. It's really the same thing. An action have reaction.
The reaction might be nothing, but that in itself is an action.
How about death?
Doesn't really matter. I was dead billions of years before this life. Didn't affect me before. The next death won't do much either.
What will happen? Who knows, but we'll all find out, in some way or another.
How about the universe?
Now this is a tricky one, mostly because it's based on theoretical physics/math, and observations.
There's diverse guesses, but that's really it.
Was there a big bang? Perhaps. Best model there is atm.
Is it all a hologram/in our minds/etc? Bugger if I know.
But interesting to ponder about.
What will be the fate? Will it all expand into nothingness? Will it all collapse? Will the sky suddenly rip open and a face look down and go "Darn, look at this mess!" and throw it out?
Do I believe there's more than what we can see/measure?
Jep. Seen/felt too much not to.
But there's no real proof of anything. No real theories to back it up.
And that's a shame.