Hebrews 3:12
See to it, brothers and sisters, that none of you has a sinful, unbelieving heart that turns away from the living God.
12 Be careful then, dear brothers and sisters. Make sure that your own hearts are not evil and unbelieving, turning you away from the living God. 13 You must warn each other every day, while it is still “today,” so that none of you will be deceived by sin and hardened against God. 14 For if we are faithful to the end, trusting God just as firmly as when we first believed, we will share in all that belongs to Christ.
I only need observe that sin is deceptive, hardens us against God and is extremely serious. To live this way does not deprive the believer of salvation, but of the "sharing of all that belongs to Christ."
This is true on this globe and will be true in eternity when works are judged as to quality.
If any man's work is burned up, he will suffer loss; but he himself will be saved, yet so as through fire.