Although the word backsliding or backslider is only found in the Scriptures a few times, it is implied in several different places. First of all we need to define exactly what the word means. It means turning away, rebellious, apostasy.
Many people give several reasons for backsliding, and perhaps there are.
And if that is the case we will not go to Heaven. I will give you a few Scriptures where backsliding is mentioned or referred to. Yes, a person can sin and that starts the process of backsliding if they don't repent. But, the end result will be a denial of the faith. Thus, causing the person to miss Heaven.