"What does the Scripture say? 'Abraham believed God, and it was credited to him as righteousness.' Now when a man works, his wages are not credited to him as a gift, but as an obligation. However, to the man who does not work but trusts God who justifies the wicked, his faith is credited as righteousness" (Romans 4:3-5, NIV).
From the days of Adam and Eve, God has wanted us to trust him. Regrettably, we have failed him. We have tried to make up for our lack of faith by working at being good, but that has not brought us any closer to God. He is not impressed with manipulation. He simply wants us to trust him. God wants us to see him for who he is, and to place our confidence in his character and power.
When God sent Jesus Christ to die and to be resurrected for us, one of his primary goals was to show that he was worthy of our trust. He was demonstrating how far he would go on our behalf. "And we know that in all things God works for the good of those who love him, who have been called according to his purpose...What, then, shall we say in response to this? If God is for us, who can be against us? He who did not spare his own Son, but gave him up for us all---how will he not also, along with him, graciously give us all things?" (Romans 8:28, 31-32, NIV).
God has proven himself to be trustworthy. Now he asks to be trusted.