Romans 1: Are atheists without excuse?

Romans 1 is a theistic fav when it comes to "showing atheists the error of their ways". Here is the specific passage:

Romans 1:20 For since the creation of the world his invisible attributes, his eternal power and divine nature, have clearly been seen, being understood through what he has made, so they are without excuse.

Ultimately, this is a cosmological argument for the existence of God. So according to Christians, the cosmos provides evidence for the existence of a Creator, leaving atheists without excuse on judgment day. But what on earth could we derive by simply looking at nature?

The text says that God's attributes are seen in creation. What attributes? We know from the Bible that these attributes includes jealousy, wrath, anger, love, kindness, peace. His eternal power? Omnipotence. And divine nature? Outside of time and eternal. So by looking at the birds and trees and stars can we derive the idea that there is a God who has these attributes? Even if it was possible, it wouldn't matter. What do I mean?

Christians over the centuries have made the standard of salvation clear: we have to believe on Jesus Christ as the Son of God who was sent from God as the propitiation for the sins of the world and that he was buried and raised from the dead and that he is seated at the right hand of the Father as Lord. Now tell me this: how on earth can any human being derive that from looking at creation? It's impossible.

Simply looking at the cosmos, at best, just tells us that there is a god. But Christians will claim that faith without works is dead and that just having a mental acknowledgement of God's existence is no better than the demons acknowledging God, hence the verse, "even the demons believe and tremble."

So if believing that there is a God is not good enough to make it to heaven then how does the existence of nature leave me without excuse on judgment day? Unless, the Christian is willing to compromise and say that someone can go to heaven only with just believing that there is a God, granted that they have never heard the gospel. However, this position undermines Jesus' words in John 14 where he says, "no man comes to the Father but by me."

Indeed, if there is no compromise from the standard of salvation which is confessing Jesus as Lord and believing in your heart that God raised him from the dead then atheists are with excuse come judgment day, or more correctly, if a day even exists.