Where did the universe come from? Atheistic origin science has no answer.

[Chas]

#1 and #2 are simply not true.

Earth's magnetic field is driven by its molten iron core which was there before the collision.

And the same for radioactivity. Those heavy elements were already present.

The collision would have been a glancing blow and involved only the crust and mantle.

had some metals, but not enough for magnetic field or to form land masses.
"In the collision, both cores ended up in the center of Earth" pg264http://www.think-downloads.com/download/Space/Universe/rare_earth_why_complex_life_is_uncommon_in_the_universe.pdf

That idea is a very, very minority opinion. It is tediously anthropocentric.
It also assumes an impact for which there is no evidence; the evidence points to a glancing blow not involving the cores.