What to do when approached for proselytization by aggressive religionists?
Simply ask: if their parents (or people who brought them up) have (had) the same religion as them. Most of the times the answer will be ‘yes’. Therefore, say ‘thank you for your time’ and turn away.
Sometimes, though, you might get the infrequent fanatic who was “born again” and was converted to a religion later in life, this fact supposedly making their religion more credible, since self-aware adults can decide convert to it. In such a case, ask this question: what psychosocial problems were you facing at the time you were approached by your religious recruiters or when you decided to convert? Whatever the answer, again say ‘thank you’ (with a hint of sarcasm) and move on.
There’s no point in wasting time with minds that are fixed to irrationality. They have wasted their individuality and life on lies. They are lost, so there’s no need to show any courtesy by sticking around and debating on things that do not deserve debating.