So often Christians want to claim the title of Christian and the blessings of the Lord, but are not willing to give their lives fully to the Lord. When Jesus died on the cross he paid the price for our sins, and therefore it is reasonable that we willingly give Him our life in whole. We can not serve God and anyone else.
"No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon" - Matthew 6:24