Backsliding is a problem all Christians experience in 1 form or another.
If we say that we have not sinned, we make him a liar, and his word is not in us.
Backsliding leads one to becoming an Apostate if it goes unchecked same as the carcases that fell in the wilderness for 40 years because of their unbelief.
Read Hebrews 3:7-19
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
But exhort one another daily, while it is called Today; lest any of you be hardened through the deceitfulness of sin.