Is it permissible to say, "Allow God to work through you; trust Him. If the entire universe operates with utmost beauty, then why would He be incapable of taking care of you? Why do you fear and worry about yourself? Roses do not fear, nor do even the stars"?

The summary of the answer is that trust in Allah and reliance upon Him are religiously mandated, for Allah is the Guardian, the Preserver, and the Merciful Provider. Whoever relies upon Him, He will suffice him and provide for him. Everything that befalls a person is decreed by Allah, and calamities expiate sins. As for the phrase "allow God to work through you," it contains an overstepping that is inappropriate for the majesty of Allah the Almighty, for He does not need anyone's permission, nor does He work through anyone, and He, glorified be He, does not withhold His bounty from His servants. A servant must maintain proper etiquette in addressing his Lord, for Allah helps whom He wills, and He is the Guide and the Granter of success.