Before getting involved in a debate, we have to ask what our motive is. There is no rule that says we have to avoid making points that offend the sensibilities of others or even upset them. But if our aim is to help people or win them over to our point of view, an outright attack on a person’s viewpoint or belief is likely to cause that person to defend and strengthen their belief.
Many Christians expect to be ridiculed. The Bible warned that they would be and persecuted, so when they are verbally attacked their faith is strengthened. Quietly making a point in a friendly way is a far more effective way of influencing another person than attack. This is true in any social situation.
If a person’s aim is to help free the world of religion, outright attack on believers is an inefficient method and counterproductive. If a Christian wants to win people over to their belief in Christ, being sociable and polite is far more likely to cause a person to consider what the Christian has to say. It seems to me that Tammy’s approach makes her message more appealing than the fire and brimstone brigade.