The Catholic Church does not build mosques, — what are you talking about?
Pope John Paul II chose to kiss the Koran presented to him. It was an act of courtesy, generally expected of a diplomat. He liked kissing things: he also kissed the ground wherever he went. Whatever you think of his actions, — I personally think he should have found a polite way not to kiss that book — this is his action as an individual and not an instruction to us to go and kiss the nearest Koran. Should we, given that he is our Holy Father, imitate him? There is no obligation on Catholics to do so any more that we should imitate his skiing style or Polish accent. The fact that he was polite to the Muslim we should probably imitate, especially if they mean good and give us expensive presents. I was recently given an extra yoghurt with my kebob in an Afghani meat shop. I remembered the Holy Father kissing the Koran and said “Thank you very much, Sir”. I then ate the yoghurt. The One Holy Catholic and Apostolic Church spoke through me that asfternoon to the infidels.