Atheists have a different notion of the truth, than we Christians, for example.
We believe the Truth is what really happened.
Atheists will believe what they want to believe because they don't believe in a God that sees and knows everything, from above.
If nobody cheated on that day of 2020, fine. But if they did, God knows that and will hold them accountable, when they die.
He saw them. The Supreme Judge saw their crimes. Even if they deny them.
So... Trump may be wrong, but he also may be right on the elections steal.