Proverbs 21:27 The sacrifice of the wicked is abomination: How much more, when he bringeth it with a wicked mind?
There are many people around the world that are making great sacrifice for what they believe in. In fact most religions are geared around what they must do to get to heaven through works and sacrifice.
The sad thing is that the Bible here tells us that a sacrifice of the wicked (those who are unrighteous without Christ) is nothing more than an abomination to the Lord. These people are many times good people, dedicated people yet all there sacrifice is in vain. As hard as they would try they can never be pleasing to the Lord.
The only true way that they can please the Lord is through salvation and growing in the Lord.