I am preaching this week from Matthew 6:25-34. Jesus gives us 8 reasons we should not worry. In studying, I ran across a great quote from Robert Mounce. Mounce says when we worry we are being, “practical atheists.” What a humbling thought. I’ve been awake for about 4 hours this morning and I have already worried at least a few dozen times about one thing or another.
Among the 8 reasons Jesus gives for not worrying (I won’t preach my whole sermon here) is in verse 32. He says the idolaters seek after things, but our Father knows we need them. His point is that when worry about things, or give our full effort to attaining things, we act like an unbeliever. They have no Heavenly Father who knows their needs. We do! When we worry about stuff, we forget that He cannot provide. Maybe we act like He doesn’t know? doesn’t care?…either way we live as if He does not exist. Thus we become practical atheists.
Surely we’d never say with words that He doesn’t exist. Our actions may say it for us. I’ve often said that people know would know exactly what you believe if they merely observed your actions for about a week.
Don’t be an atheist. He exists. He can meet our needs. He will meet our needs.
A Pastor's Thoughts 
You are absolutely right. Worrying is an atheistic point of view. It says that since God cannot take care of my problems then I must carry that burden myself. Totally opposite of the “rest from our burdens” Christ promised His followers.