My girlfriend is a christian, and im an agnostic atheist?

You may have problem with her parents once they knew you are an atheist, because the scripture cautioned against christian daughters being equally yoked with unbelieving men. State your beliefs and morality when asked. Her parents will pray to God to do away with the spirit of unbelief in you. As an Agnostic atheist, your case is similar to a Lab Scientist starring hard at a sample of infected blood in a syringe to see if he could locate the AIDS virus. He can do that for ages without seeing anything in the blood, because, he needs the right procedure and medium to hit at his target. You need spiritual eyes to see God whose wonderful works stare at us daily. Wishing you luck in your visit.