After you've said "What part don't you agree with", if the person answers:

I don't agree that I am a sinner,
    you can go through the ten commandments, for example, asking if he has ever told a lie.
    you can make sure your friend knows what is meant by sin; he may think it is only "big" things, but you can explain
        that even something small is a symptom that we are not perfect. See more details at Problem.

I don't agree that "my God" would allow suffering
   Suffering was not brought into the world by God, but by mankind's rejection of God (sin).
   God takes suffering so seriously that he sent his Son Jesus to suffer for us.
   In the next life, there will be no suffering.

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