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Christians have the best renewal of the mind because of the resurrection power of The Lord Jesus Christ. The Word of God gives wisdom to business owners to manage their businesses effectivelyContributing tithe can be seen as security/insurance for the business to flourish.

A business owners you need to understand that God is on your side; he will lead and direct you and also give you great ideas. He will protect you and guide you every step on the way so how can you lose. Take for example men like Rock Feller who was very much and spent most of his time with God and his family, he even spent most of wealth for establishing the kingdom of God.
He was a God fearing, church attending, Bible believing Christian who never wavered in his faith and gave more money back to the betterment society than anyone else in history. He was a devoted husband and father that made time for his family while building the most profitable organization of its time.
RG LeTourneau – Because of Faith, Mr. Tourneau lived out his divine purpose through building this wonderful machines we now use. If you are looking to be a person of vision then you should put your trust in the Lord, just as Mr Tourneau did. “God wants to impregnate you with vision”. Habakkuk 2:2-4 Old Testament. This man wasn’t religious, he had a divine relationship!
Most importantly, his contribution to the advancement of the Gospel ranks him among the greatest of Christian Businessmen of all time. Famous for living on 10% of his income and giving 90% to the spread of the Gospel, LeTourneau exemplified what a Christian businessman should be.
Zig Ziglar – Zig was a devout Southern Baptist and throughout his career, he weaved Biblical truth into his speeches, books and trainings, indirectly sharing the Gospel to millions. Even though his audiences varied greatly, from corporate behemoths like GE and AT&T to small business luncheon crowds, and the topics he spoke and wrote about ranged from personal success to closing the sale, he was able to infuse Christianity in a professional and unobtrusive way. Rather than keep his faith quiet, Zig was able to share it with the world and reach an audience where the Gospel was not as prevalent; business, personal development and sales training.
These are fantastic examples of what happens when Christian business owners put God first in their business. They should remind us of the faithfulness of God. They proof that you can push business and stick to your biblical values and also use your influence for the gospel of God. 
You should encourage all Christian business owners to follow the example of these great men and bot compromise on their faith and just wait and see what the lord will do.
*These examples and more can be found in on the giants for God websites at http://www.giantsforgod.com