Read in your Bible Mark 12:42 - 44: Jesus said "Verily I say unto you, that this poor widow hath cast more in, that all they which have cast into the treasury...she of her want did cast in all that she had, even all her living.
What the Lord is saying if we cannot give all then why give any? We are not obligated to give anything but ourselves. Christ paid it all on the cross and bought us for a price (his life). We are to give our all. NO PERCENTAGES.
Besides if your husband is not a born again christian (it does not sound like he is) then he does not need to give anything but his life to Christ.
That is what we are obligated to do...we give 100% of ourselves to Christ, he asks for nothing LESS.