There is a difference between trusting Christ and trusting in Christ.
I trust all the banks in my city...I think they all would be a safe place to deposit my money. However I trust in only one bank, and that would be the one that has my money. The fact that I deposit my money in that bank is a demonstration of the trust I have in it.
Too often we trust Christ, but it's only a head thing...we "think" he is trustworthy, but we don't act accordingly...our behavior contradicts our thinking.
Trusting in Christ is demonstrated when what we "do" aligns with what we think/believe.