There is nothing in the Bible suggesting there were people outside of Eden, it is not Biblical.
That's not true. When Cain is kicked out of Eden, he builds a city and gets married. He also worries that someone outside of Eden will kill him. Yet the Bible has yet to mention the birth of any other children. And Genesis chapter 1 mentions the creation of humanity, leaving that possibility open.
Genesis 4:1-2, 8-17, 25 ESV
[1] Now Adam knew Eve his wife, and she conceived and bore Cain, saying, “I have gotten a man with the help of the Lord.” [2] And again, she bore his brother Abel. Now Abel was a keeper of sheep, and Cain a worker of the ground.
[8] Cain spoke to Abel his brother. And when they were in the field, Cain rose up against his brother Abel and killed him. [9] Then the Lord said to Cain, “Where is Abel your brother?” He said, “I do not know; am I my brother’s keeper?” [10] And the Lord said, “What have you done? The voice of your brother’s blood is crying to me from the ground. [11] And now you are cursed from the ground, which has opened its mouth to receive your brother’s blood from your hand. [12] When you work the ground, it shall no longer yield to you its strength. You shall be a fugitive and a wanderer on the earth.” [13] Cain said to the Lord, “My punishment is greater than I can bear. [14] Behold, you have driven me today away from the ground, and from your face I shall be hidden. I shall be a fugitive and a wanderer on the earth, and whoever finds me will kill me.” [15] Then the Lord said to him, “Not so! If anyone kills Cain, vengeance shall be taken on him sevenfold.” And the Lord put a mark on Cain, lest any who found him should attack him. [16] Then Cain went away from the presence of the Lord and settled in the land of Nod, east of Eden. [17] Cain knew his wife, and she conceived and bore Enoch. When he built a city, he called the name of the city after the name of his son, Enoch.
[25] And Adam knew his wife again, and she bore a son and called his name Seth, for she said, “God has appointed for me another offspring instead of Abel, for Cain killed him.”
All sinned because Adam was first man created and thus in him, all of humanity sinned. If there were other humans, then not all would have sinned.
5:12 Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned.
Having people outside of Eden does not contradict Adam being the first to sin.
As Romans 3:23 says 'For all have sinned, and come short of the glory of God;'
There is a reason Adam and Eve were blamed for the fall of humanity, because all humanity comes from them.
Adam introducing sin into the world, does not contradict there being people outside of Eden.
1 Cor 15:45 confirms Adam was a first human being 'Thus it is written, "The first man Adam became a living being"; the last Adam became a life-giving spirit.'
1 Corinthians 15:45-49 ESV
[45] Thus it is written, “The first man Adam became a living being”; the last Adam became a life-giving spirit. [46] But it is not the spiritual that is first but the natural, and then the spiritual. [47] The first man was from the earth, a man of dust; the second man is from heaven. [48] As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. [49] Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven.
Jesus was neither the second man, nor the last man to live. This isn't about biology. It's theological in nature. In fact, Paul even points out that we are all dust, just like Adam. But that doesn't people that I am the first man, just because I am of dust like Adam.
And we can read this passage and see that it also has nothing to do with human origins. Jesus is talking about the resurrection in this section and what kind of body we will have.
Animals were not created as an image of the living God. Why you comparing this. It has no relevance?
I'm pointing out that Genesis 1 never actually mentions just 1 male and 1 female fish, or 1 male or 1 female bird. Indeed, even on day 6 it never mentions just 1 male and 1 female person either.
Yes it does. And you have been proved so by many of us on here. But you trust scientists who say there is no God,
Nope. Adam and Eve are never mentioned in chapter 1. You assume that to be the case, but, they aren't.