Although Pope Francis does not support same-sex marriage, John praised the Pope's attitude toward LGBT people as a sign of progress in an interview with Sky News, the AFP reports.
"He's excited me so much by his humanity and taking everything down to the humility of faith," he said. "It's all basically about love and taking everybody in inclusiveness."
The singer, who plans to marry longtime partner David Furnish, with whom he has two children, also said Jesus would approve of same-sex marriage, which became legal in England earlier this year.
"If Jesus Christ was alive today, I cannot see him ... saying this could not happen," John said. "He was all about love and compassion and forgiveness and trying to bring people together, and that is what the church should be about."
John also said he wants to meet with Russian President Vladimir Putin to discuss the country's stance on gay rights after Putin said many Russians were fans of John "despite his orientation."
"As long as I'm alive, I will fight for people's rights," John said.