Why would you think he wasn’t?
I don't know that he was or wasn't faking it.
I can't answer that until you tell me why you believe he was born that way and what you mean by faking it.
I've know several gay people throughout my life. They are born that way. trust me.
For some month in my life I knew a homosexual man and a homosexual woman. He had been sexually abused from his father, when he was a little child. She was sexually abused from her grandfather and his friends in the age of 6 - 16 years. She hated all men and I took care not to hurt this hate, because this hate kept her alive. I had to suffer under her hate too - but I took it with patience. Fortunatelly she had friends under nuns too.
Perhaps you could ask yourselve what you really know about how hard life is for some of our sisters and brothers, while you play your asshole-role and feel mighty.