Find a "respecter of persons" in the Bible. John 1:12 is in the Bible. It's message is very clear. But, how doesn't election not make God a "respecter of persons?" Some are chosen for eternal life and some are not (only one other choice).
I thought I had edited the "respector of persons" phrase out of my response, but apparently not. It's used once in the KJV, and in the context, what it means it that God doesn't show favoritism based on nationality. It's a confusing phrase, so I intended to edit it, and thought I had.
Here's the point. God chooses all sorts of people. Jews and gentiles, women and men, kings and those in authority, people from all nations. Not just wise people, not just powerful people, not just rich people--in fact, not many of those sorts of people--but foolish people, weak people. Since God chooses all types of people, he doesn't show favoritism to one type. If he did choose a certain sort of person, then the grounds for God's choice would be in the person themselves. They would be chosen because they are the right sort of person. But that isn't the way it is, because God doesn't show favoritism.
And furthermore, if God chose people based on their meeting some requirement or criteria, then the very same criticism (that he shows favoritism) could be made: that he shows favoritism by choosing one type of person, the sort of person who meets that requirement or fulfills the criteria. If he chooses based on foreseen faith (or, as some here seem to think, on the basis of already expressed faith) then he is choosing the sort of people who are inclined to believe. People who are humble enough, perhaps, or people who are wise enough to recognize their need, or whatever. He is still choosing people based on some quality within them or something about them. That is showing favoritism just as much as choosing mostly wise people, or people all of one nationality, or whatever.
That's why an impartial God has to make the choice not based on anything within or about the persons he chooses. The choice has to be based within God alone or he is showing favoritism. God's choice has to be based in nothing about the person chosen.
Now that doesn't mean people don't have to believe to be saved. They do. It just means that people aren't chosen for salvation
because they believe, but rather people believe because they are chosen for salvation, and that choice for salvation is based on nothing within themselves, but only things within God himself--like, for instance, the freedom of God, the self-existence of God, which means that everything that comes to be or comes to pass existed first as a thought in God's mind, and the flow of information goes outward from God to creation and not from his creation to God.
And that's what I think it means when it says in Romans 9 that God's choice doesn't depend on the person "so that God's purpose according to his choice might stand." God's freedom and self-existence require that the choice be based in himself and his plan.
John 1: 12, btw, is not speaking to the issue of election. It does talk about adoption, and of course, only those who believe are adopted. You'll get no argument from me on that point.