The Martian rock may be a hint- but sadly, that's all it is.
I remember when the announcement was first made and the excitement (for me) that it caused.
Sadly, it's only a hint- a could be... There isn't much left to study there to see what it was exactly, that looked like microbes.

Even if there had been, and those Microbes were Earth like or had the same DNA structure that we do- it could be panspermia from Earth to Mars, that later was sent back to us in that meteorite.

We just don't know.

If it was life but different- it wouldn't be particularly surprising.
Millions of years ago, the conditions on Mars were quite suitable for life.

We just are flat out lacking evidence at this time.
The only strong evidence we have is probabilities, chemistry and observation of how these things worked out on Earth. Even that, is more than vague as to how we originated.

Personally, I do not care if we are the result of Earth combined with space, Earth Abiogenesis, alien seeding- Whatever. I just want to KNOW what it was.
And it doesn't look like we will have much to base that knowledge on anytime soon.
Our best guess is the one that currently makes the most sense. And that is that the life that is here originated here.
That it did so because of the chemical reactions that, almost inevitably, lead to life.

It's amazing to me how we can always, always, always discover that the things we thought were amazing turned out to be based on very simple and mundane science. Like Virii causing illness rather than demons.
And yet, when there is uncertainty or an unknown, people then think that it's suddenly, magically, OK to start pandering to the fantastic. Do they refuse to accept that the odds are great that that one will also turn out to be basic and mundane and well founded in science? Or is that ONE Special in some way that unlike everything else, it can be fantastic simply because they want to believe so and can get away with it because we currently lack evidence?

Why does ignorance always have to beget arrogant delusions?