I am a recent convert. I was baptized for the remission of sins just a few days ago. Now I’m wondering. I have crucifixes hanging on the walls in my home, and I often wear shirts with religious sayings on them. For example, I wear a hat that reads “Jesus is Lord” and t-shirts with this saying as well. I always took it as my way of confessing Jesus is Lord to men (Matthew 10:32). I converted from Roman Catholicism, and this is fine to wear as a Catholic, but now I am wondering as a member of the church of Christ, should I not wear clothing like this? Should I take the crucifixes off my walls?
In part, the answer to your question lies in your attitude toward these things as well as the attitude of others. My guess is that as a Roman Catholic, you had hung the crucifixes on your wall as a display of your devotion to God. Those who visited your place would be impressed by how religious you were. But consider Jesus' admonition: "Beware of practicing your righteousness before men to be noticed by them; otherwise you have no reward with your Father who is in heaven. So when you give to the poor, do not sound a trumpet before you, as the hypocrites do in the synagogues and in the streets, so that they may be honored by men. Truly I say to you, they have their reward in full" (Matthew 6:1-2). Having religious icons on your walls doesn't make a person religious. It is how you live your life that is important.
Then, there are those who treat these man-made icons as if they were holy in some way. In doing so, they are treating the icons as idols. See Is having a symbol of Christianity idolatry?
If your t-shirts are being worn as a conversation starter, then there is no problem. But if you are wearing them to say, "Look at me! I'm a Christian!" then we are back to the problem of trying to look religious instead of focusing on being religious.