Let's kick the can down the road of "who created the aliens?" and simply consider the alternatives for "who created us?"

On the one hand, you have ALL major religions agree that powerful beings who came to earth (or created Earth) and populated it with humans.

On the other hand, you have the "scientific" alternative. This is where you have several different asteroids all exactly the right size to have proto-atmospheres. Each atmosphere is different because the fundamental building blocks of life can't all form in the same atmosphere. They all develop their specific part of the equation. Now, they all happen to crash together in the exact same place at the exact same time. Their material is thrown together onto yet another asteroid with a different atmosphere sufficient to sustain life. Those materials happen to collide just right so they form a primitive lifeform. Finally, this meteor happens to crash on Earth (instead of any other planet) without generating enough heat or impact force to destroy the fledgling lifeforms and it happens to land on a part of Earth where the lifeforms won't be killed off by the surroundings.

What are the odds all those asteroids form? That every one has different atmospheres? That the all hit the exact location at the same time? That the constituent parts aren't destroyed in this crash? That the parts randomly come together to form life? that this happens close to a solar system? That the solar system has the right star and planets to support that life? That the life isn't destroyed?

Now put that up against a powerful alien (which could have formed under different universal rules without such astronomical odds) implanting life on a planet?