Does it make sense for atheists to mention God in their expression?

“For God’s sake”, “Oh my God”, “for the love of God”, ” God dammit”, when someone sneeze you say “God bless you”, all these expression are common in our daily usage. However, if you’re an atheist does it make any sense to use such religious expression? Will it be mocking people of religious background? Or are they merely just some common expression and the word “God” there already lose its true meaning (and devotion) for the speaker and work only as an exaggeration?