I used to (before my conversion and calling to the priesthood) go to bars on the weekends, get drunk, try to sleep with a lot of women and then go to Mass like nothing was wrong. "I am a Christian who has faith", I thought to myself. I love God and want to go to Heaven. Funny thing was, I wasn't serious enough about my faith to change my life and I did not smell the burning sulpher underneath the lie I was living before God and others. God did love me and He wanted me to go to Heaven, but my life's choices said something else.
God takes our free will seriously. He does not force us to change, to turn away from sin, and follow Him. We can take it or leave it. Thing of it is, when we choose not to take God seriously we have to understand there is only one other place to go... and it is NOT HEAVEN.