Telling my parents

[KevinM1]

Hello, I am almost 19 years old, living in a christian household. My parents are very active in the church, I have not been going recently and my parents haven't mentioned it. They usually just let me sleep cause I was at work late, etc.  I am going on a month long trip with my boyfriend in November and immediately after we will be moving into an apartment together. I am finically independent besides my cell phone, and living in their home.  None of my brothers and I actively show interest in church or the bible but they still assume we believe in god.  

I do not know how and when to tell them I am no longer a believer. I have to tell them because they are so against sex before marriage and cohabitation that they need to know I don't think its wrong because I am an athiest. They are super close minded and will be very angry and sad and there will be lots of arguing. Does anyone have any advice or been in a similar situation?

Thank you!

Be sure you have all of your financial ducks in a row before doing it.  Car, rent, phone, food/utilities, enough money to pay for deductibles/co-pays, that sort of thing.  That way, if they threaten to cut you off from your phone or not accept you back if your relationship with your boyfriend turns sideways you can simply shrug it off.

And, they're against premarital sex and premarital cohabitation, but not against you going away for a month with your boyfriend?  That seems odd.