One concept to keep in mind is that Darwinists tend to believe that God is no more than a two dimensional story book character. Which means they feel free to assign attributes to Him that to make Him look illogical or irrelevant, without consideration to what the Bible actually says.
Now let's take this point by point.
1. The wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who hold the truth in unrighteousness.
Darwinists are the first to point out what they think of the God of the Bible, full of wrath, angry. One atheist t-shirt reads "God is angry every day, maybe he's angry at you." This is of course taking a Bible verse out of context. The King James adds the words "with the wicked" to help people understand the obvious. Without even knowing the exact statistics, I know that someone is doing something criminal, malicious, hurtful or evil at any given moment. Is it wrong for God to be angry at these things? If not then, God would be angry every day. This is a problem for a two dimensional character, but not for an omnipresent, omniscient being. But are they interested in understanding God's character, or just complaining? Liking, disliking, understanding or misunderstanding what the Bible says about God has no impact on whether he is there or not, or on his true character.
If you look through the Bible you can find all sorts of terrible things that are connected directly with God, he sends plagues, killing angels, disasters, starvation and many other things. Personally, if I thought that was all there is to God, I wouldn't want to believe in him either. But that is not what God is like. This viewpoint is very narrow and self serving. Its a viewpoint taken by people who don't want God in their lives and want to find a way to justify their position.The Bible clearly states that this wrath is directed at ungodliness and unrighteousness and towards those who hold back the truth in their unrighteousness, not to everyone. Since Darwinists reject God's Word they believe that it is good to prevent people from believing it. Therefore rejecting God's word is a moral act in thier eyes. They hold back the truth in unrighteousness. Darwinism is an attack on the God of the Bible, their slogans, music, literature all focus on the God they reject, even the modified fish symbol they proudly display. How many anti-Hindu, anti-Islam slogans are the Darwinists displaying.
2. Because that which may be known of God is manifest in them; for God hath showed it to them. For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse:
God's creation, and especially man, is evidence for the existence of God. Even before molecular biology it was clear to many people that the design of life was evidence of God. Darwin unwittingly used scientific ignorance to his advantage when he introduced his theory of natural selection and variation. But now, with the advancements in science there is no excuse not to recognize the need for an intelligent designer and understand how powerful God must be to have created life and this universe. Darwinists reject the evidence and insist that they can see evolution, so they are without excuse.
3. Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
The Darwin fish symbol is clearly predicted by this verse. The fish symbol, taken from Christianity, confirms that they know who God is. But they hate the idea of God. They are not thankful for, but curse the idea that this is God's universe, not their own. Their imagination has lead them to believe that organisms over time really could change into all the life that we see and that molecules really can spontaneously combine to be able to create and store information.