Pope attacked the new law legalizing same-sex marriage and asked the Europeans to rediscover Christian teachings.
Sky News shows that almost 200 gays and lesbians have organized their five-minute long "kiss-in" as the Popemobile drove past the crowd.
Sergi Diaz, one of protester, said: "We are here to demonstrate against the pope's visit and call for a change in the mentality of the Catholic institution which still opposes our right to different ways of loving."
Helena Coll added: "Religions speak of peace, humanity, of respect but then they they discriminate against these values."
"Homophobia. Hypocrisy. Corruption. Confessional state. Paedophilia. Vatican bank. NO THANK YOU," was written on one large white and black banner hung on the balcony of an apartment near the Sagrada Familia Church.
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