I don't see why LBGT folks should offer the hand of friendship to any group which seeks to deny LBGT people the same civil rights that group assumes it's members are entitled to.  

Unless Father Martin is prepared to give his unqualified public respect and approval to gay marriage and homosexuality I don't feel he is qualified to lead a reconciliation campaign, although he is clearly qualified to speak to many other subjects.

As example, suppose I said that I have the right to vote, but represent an organization determined to block your right to vote, and won't myself personally call for your right to vote, but I love you and want to be friends.   Credible?  

Father Martin wants his cake and eat it too.  Sorry, not buying it.  His sermons on many other topics still welcome.