Hi beacha,
It's good to hear your know the lord and are growing in him, we all are and none of us are perfect either. It's good to hear you also love your husband that's a good thing. But rgarding your husband beating you for sin, I think you already know the answer.. It's wrong. It's not part of How God gives grace to us.
When your are saved you are no longer under condemnation:
Therefore, there is now no condemnation for those who are in Christ Jesus (Romans 8:1).
And yet we still sin, but we have a loving Father who will forgives us our sins and restore our relationship with Him:
"If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. (1 John 1:9)
You see it's God who has atoned for your sins himself, and when you do sin as His child and repent He is the one is faithful and fully forgives.. Your husband beating you can do nothing but hurt you. A husbands role is to protect you,meet your emotional and spiritual needs. I can say this because a husband is to be like Christ is to His bride (Christians), leading by being a servant.
Anyhow, I pray that you can both possibly get counselling, your husband certainly has issues regarding what it is to be a husband, and what it is to be a man wanting to honour his Saviour (that's if he is a Christian). Your marriage can be good and wholesome but As I think you already know there are some real problems that need dealt with. Anyhow, I pray that God works in your life for the right outcome.