I thought accepting and believing in Jesus as Lord was all you needed to enter heaven?
John 6:40 (KJV) 40 And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
Do you honestly think you're raising a novel point and not just being trite? If so, try reading Luther's Concerning Christian Liberty, where he dispenses with this argument. Or if you want a short version of what he says, if you just claim to "believe in" God but that doesn't affect your behavior in any way, then you don't really believe.