What is the use of arguing over something like sola fides when so many people out there need the help of humble and loving Christians who have the capabilities to grant said help whichever way they can? None. There is no point in debating about the letter of the law when the spirit of the law is clearly being taken for granted.
The Secret is actually very Christian - and the author and her collaborators even say so themselves. Positive thinking and the attitude of gratitude are actually traits we are called to embody as true Christians, through living a life of love and service to God and to others as our way of expressing thanks for all God has done for us. We indeed have the freedom to think our ideal lives into existence - but also the duty to keep it rooted in God and His purposes.
"Religion that is pure and undefiled before God, the Father, is this: to care for orphans and widows in their distress, and to keep oneself unstained by the world." -James 1:27, NRSV-CE
"Blessed is he who considers the poor! The LORD delivers him in the day of trouble; the LORD protects him and keeps him alive; he is called blessed in the land; you do not give him up to the will of his enemies. The LORD sustains him on his sickbed; in his illness you heal all his infirmities." (Ps. 41:1-3, RSV-2CE)
"Do not judge, so that you may not be judged. For with the judgment you make you will be judged, and the measure you give will be the measure you get." (Mt. 7:1-2, NRSV)
Christ gave us new life in rising from the dead, triumphing over sin so that we can hope in eternal life. It is our duty and calling, therefore, to make the most of this opportunity for His greater glory.
Today, as we remember the ultimate sacrifice Jesus made for us, we are reminded to mimic His example of loving - the greatest love of laying down one's life for his friends.