My girlfriend is an unbeliever who has quite a bit of trust in science and its theories, and now and again we have discussions that boil down to reasons she doesn’t believe in God. I asked her to tell me what she doesn’t understand, and that I would put them in an email and send them to you, as my answers ‘are the ones Christians always give.’ These are honest questions from her and are the actual reasons that stop her from looking for God. In her own words, she just doesn’t understand it all.
The problem is not that your girlfriend needs answers to her questions that are different from “the ones Christians always give.” The problem is your girl friend is asking the wrong questions, and until she asks and answers the right questions nobody can help her with her other ones. In 1 Cor. 2:14 Paul explained it this way.
“The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are spiritually discerned.”
The questions your girl friend needs to ask and answer for herself are these: “Do I believe I am a sinner? Do I believe God sent His son to die for my sins so I can have eternal life? Do I accept His death as payment in full for my sins?”
If she answers yes to these questions, God will send His Holy Spirit to guide her into all truth (John 16:13). When that happens she will realize that the answers you gave to her other questions were correct all along and she will finally understand.
Paul said, “When I came to you, I did not come with eloquence or human wisdom as I proclaimed to you the testimony about God. For I resolved to know nothing while I was with you except Jesus Christ and him crucified” (1 Cor. 2:1-3).