I was surprised a few years ago to learn about something called International Blasphemy Day. According to a blog post by Albert Mohler  back in 2009, Blasphemy Day was dreamed up by a group called the Center for Inquiry. There was a blasphemy contest, as well as an effort to get folks to officially reject faith in God via YouTube videos.
You can read Dr. Mohler's excellent suggestions  for responding to that kind for bold, organized rejection of God (including the refusal to be offended and outraged or anything, really, but saddened).
And what does King David say about mockers, a title that seems to fit those creatively blaspheming against Christ, God, and the Holy Spirit for T-shirts and mugs? Simply this: Steer clear. Don't walk, stand, or sit with them, philosophically speaking. Recognize the dead-end path they're on and head the other way.
Why? The first motivation David offers is that God blesses (makes happy?) those who refuse to participate in rejecting Him and His way. Put positively, blessings, support, and connectedness is found in trusting God and enjoying His Word.
Think: What's your first reaction to those who openly mock God or faith in God? How can you demonstrate God's love, grace, and forgiveness to people who see your faith in Him as foolish?
Pray: Ask God to help you not to follow the path of those who reject Him even while representing His love and grace to them in the power of the Holy Spirit.
Do: Identify a few people in your life who you know have rejected Christ and commit to praying this week that they will be drawn to trust in Him, instead.