Jesus never gave an opinion about gay marriage. So good for the pope.
He did talk about marriage though. And in that discussion - although some will no doubt disagree with my interpretation - he did mention that some were born homosexual.
Can you cite the chapter / verse? (Not the passage about marriage, I know that one, but the second thing you said.)
It started with a smart alecky pharisee trying to test Jesus on the subject of divorce. That led into a conversation of marriage and
a conversation of who shouldn't get married.
Matthew 19:1-12
Teaching About Divorce
1 Now when Jesus had finished these sayings, he went away from Galilee and entered the region of Judea beyond the Jordan. 2 And large crowds followed him, and he healed them there.
3 And Pharisees came up to him and tested him by asking, “Is it lawful to divorce one’s wife for any cause?” 4 He answered, “Have you not read that he who created them from the beginning made them male and female, 5 and said, ‘Therefore a man shall leave his father and his mother and hold fast to his wife, and the two shall become one flesh’? 6 So they are no longer two but one flesh. What therefore God has joined together, let not man separate.” 7 They said to him, “Why then did Moses command one to give a certificate of divorce and to send her away?” 8 He said to them, “Because of your hardness of heart Moses allowed you to divorce your wives, but from the beginning it was not so. 9 And I say to you: whoever divorces his wife, except for sexual immorality, and marries another, commits adultery.”
10 The disciples said to him, “If such is the case of a man with his wife, it is better not to marry.” 11 But he said to them, “Not everyone can receive this saying, but only those to whom it is given. 12 For there are eunuchs who have been so from birth, and there are eunuchs who have been made eunuchs by men, and there are eunuchs who have made themselves eunuchs for the sake of the kingdom of heaven. Let the one who is able to receive this receive it.”