Here I am a Catholic for 45 years.
"I assure you, as often as you did it for one of my least brothers, you did it for me." (Mat 25:40)  We can understand from these words that God is immanent in all of us.
  
However, CI (Catholic Institution) clergies do not believe God is immanent in all of us or they just don’t believe there is God at all.  Since they condone clergy rape of God in children!
Or CI clergies do not believe God is omniscience, since they try to hide clergy sex abuse of children.
So in that case what is the use of discussing LGBT are sinful or not? 
No matter which way you looks at the clergy rape of God in children compare to same sex marriage of LGBT peoples, LGBT are angels, don't you agree?  

If you are interested in following Jesus teaching as you claims to be, by all means try to teach CI clergies why raping God in children is grave and grave sin even Jesus will not forgive but put heavy millstone around rapist neck and throw them to the bottom of the sea!!!!!!