"I used to be a deluded, ignorant, and hateful Christian like you until I learned to be better than you!" This is the essence of personal testimonies (variously called “deconversion stories,” “ex-timonies,” or “anti-testimonies”) given by people who claim to have de-converted in some way from orthodox, Evangelical Christianity.
The new atheists are not called "angry atheists" without reason. Instead of engaging in serious dialog they tend to go for one's emotional jugular. They will blaspheme Christ and insult Christians in the most demeaning manner possible. David Kowalski lists the kind of tactics one can expect from them.