Parking a bicycle in the garage will never make it a car.
Even sitting in the office of your Boss when he/she is away,it won't make you a Boss.
No matter how long you park your car at an airport it will never become an aeroplane.
The same with being in a church for years, it will never make you a christian, but receiving Christ and changing your old sinful ways will definitely make you a Christian.
Don't just be a church goer but be a transformed Christian. Repent in totality.