They pass on genes, they just tend to pass on less, and to be less atractive. I think it has to do with the fact that the females of all species have needed a male with strength to protect them, intellegent people tend to not fit that critiria.
I am not a biologist, so I will not argue this much further, but please realize that "knowing truth" is just not something that natural selection selects for. It is about who has the most grand kids, and even if knowing truth was beneficial for that, we couldn't know that for sure. So maybe our brains function well to get to truth, but maybe not. Maybe your argument seems true to your brain, but in reality it just causes you to have more kids but is totally false. Your brain just tricks you to think its true because that will cause you to have more kids. If all we have to go by is natural selection, we cannot be certain that our minds are rational.
First point, if he was all loving he whould let animals in.
First of all, as a naturalist, why do you even care about animals. They are just a bunch of heaps of molecules, just like you and your parents and your siblings. There is no such thing as value, meaning, good, or bad if all we have as brute physics. So from your point of view you shouldn't have a concern. After all, nature doesn't do anything great for heroic people or dogs.
Now as far as God is concerned, from his own standpoint he simply did not create animals to have a relationship with Him in the sense that humans do. Getting into heaven is not about saying a prayer and having fire insurance for the rest of your life. People were created to live in a meaningful relationship with their God, and only humans have the capacity to have that kind of relationship that involves choice love and trust. Animals do not go to hell, as far as I understand they do not go anywhere when they die. But to call this bad is like condemning people for kicking rocks.
Also, in order to argue your point convincingly, if all animals should go to heaven, where do you draw the line? You have millions of bacteria living in your intestines. Do you ever think about how you treat them? What about termites eating your house? How about the lice in a dogs hair? Don't you also place different value on different animals? Do you ever use bug spray, or do you eat vegetables that have been treated with pesticides (unless you are vegan and eat nothing but organic food, you are too killing animals) Have you ever taken medicine to kill bacteria or viruses that were living in your body? You also draw the line somewhere, I just draw it between humans and animals, you probably draw it somewhere between small pet rodents and mice, rats, and roaches.
Now, if Christianity is true, than I know that there is a qualitative difference between humans and animals, and that while we were placed on earth to tend to it, we are allowed to use its resources and that killing animals is not inherently evil. I'm not talking torture for fun, but I use bug spray, I buy Wal-Mart food, and I eat meat.
On a final note though, in my reading of the Bible there may well be animals in heaven. Check out Isaiah 11:1-10. I think this refers to heaven, or at least some time (millennium ?) between the earth as it is now and the eternity in heaven. It talks about animals being there. I just do not think that those will be "the same" animals as those alive right now. But how knows, if you do choose to have that relationship with God and go to heaven, you might just get to see Dinosaurs there or something.
Finally, I don't think we are going anywhere on this scientist thing. Yes, Galileo doubted that the sun went around the earth, but so do I. That was not a religious issue. Sure, the Catholic church has suppressed scientific advances at times, but please remember: The University itself was invented by the church. All the older universities began as theology schools that only later added other faculties. The only reason science like we know it today got even started was because people believed that God had created an orderly universe and that BECAUSE of that, repeatable experiments would yield the same results. We still speak of "laws." Well initially it was assumed that God had made "natural" laws just like he had made moral "laws," so the whole enterprise in science got started out of a Religious motivation. Reason and knowledge is not opposed to Christianity. Sure, there are always fundamentalists, but I am perfectly fine following the evidence and trying to be reasonable, but at the same time I believe that the Bible is the completely true word of God. And I am not a minority, neither today, nor in the 2000 years of church history.