Just a reminder that he died for our sins, so if we don't sin a little bit within our life he died for nothing... Am I wrong?
Yes, you're wrong. Jesus was the only person to ever walk this earth without sinning. We all sin. But we must repent to be forgiven. Here's an apology. Somebody smacks you in the head and says sorry, you forgive them, it's all cool. But then they smack you again and say sorry, and again and again etc... Are they really sorry? Sure, you should still forgive them, but are you still gonna hang out with that guy?
So I have this question bothering me. Mary said she was a virgin and Jesus was her son. So did Mary lie about her being virgin or was Jesus the first test tube baby?
In most cases, no. Forgiveness is wack and far from secular, intuitive responses to peoples' actions.