This really isn't anything different than any other president has said in living memory. If anything, it's not as extreme as some of them.

For example-

No, I don't know that atheists should be regarded as citizens, nor should they be regarded as patriotic. This is one nation under God.

That was George H. W. Bush.

That said, I will give his piece of shit son credit for one thing. He said this:

I will be your president regardless of your faith. And I don't expect you to agree with me, necessarily, on religion. As a matter of fact, no president should ever try to impose religion on our society. The great – the great tradition of America is one where people can worship the – the way they want to worship. And if they choose not to worship, they're just as patriotic as your neighbor.

https://en.wikipedia.org/wiki/Discrimination_against_atheists#United_States

I can't remember any other time when a Republican at pretty much any level, let alone a president, would say that about atheists.

I sure do love being forced to vote for a capitalist christian in every goddamn election.

Sure makes me feel like I fucking belong here.

I mean he's not wrong.

If you look at the founding documents, there is ZERO mention of Jesus or Christianity and only one mention of "God" and that's in the Declaration of Independence, not the Constitution.

"When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation."

Nature's God, which had and has a very specific meaning.

https://en.m.wikipedia.org/wiki/Deism

Good book on the topic:

https://mwstewart.com/books/natures-god/

This is why, in the Treaty of Tripoli, the first international document to recognize the US as an independent nation, it reads:

“As the government of the United States of America is not in any sense founded on the Christian Religion, as it has in itself no character of enmity against the laws, religious or tranquility of Musselmen, and as the said States never have entered into any war or act of hostility against any Mehomitan nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries.” 

Musselmen = Muslims
Mehomitan = Islamic

I'm an atheist. But I understand the need for this language because the majority of the country believes this bullshit so you have to pay lip service to it.

Not too long ago you couldn't have a Catholic president saying this isn't a Christian nation. It's smaller progress than could be hoped, but at least it's a step in the right direction.

Humans as a whole are selfish, greedy, short-sighted, ignorant, aggressive, toxic assholes.

Saying we're made in God's image is one of the hardest-hitting insults at God we could possibly drop - it's literally an attack on every single one of Sky Daddy's features.

In the same breath, Biden asserts that every person is created in the “image of God,” implying a place for faith in interpreting America’s founding principles.

coming from a Catholic that was in office when Roe v. Wade was overturned

feels more like United States of Christ than ever