Dante diagreed...he distinguished sever layers of Hell for different sins.
There is a tradition in some religions of sins that are essentially misdemenors for which you are sent to Pergatory (the equivalent of a County jail) wo spend time rpenting)..and then there are "mortal sins", essentailly serious divine felonies for which you are damned to hell for eternity (do not pass GO).
Sin is often defined as acts that separate you from God, so to some extent, the severity of the sin depends on your intention for committing the sin, and your repentwnce as you try to reestablish youself in God's good graces.
So, yes, there are degrees of sinning and repentence...a personal dialog beween you and your God. Your sin separated you from him (the definition of sin) and your repentence is your efforts to demonstrat that you learned from the experience and are demonstrating your new-found grace that gives you the strngh to avoid those sinful acts in the future.
At least that's my philosophical and escatological perspective after years of study and prayer.