I already told you when. At the beginning of WW1, more precisely 1915.
Why? I already told you this. The only thing I didn't really expand on was the religion aspect. But I heavily implied it with the mentioning of "Jihad" and "nationalistic muslims". The victims were mostly christian.
How? Mass deportation, starvation, drowning, crucifixion, burning.. you name it.
How many? It is estimated to be around 1.5 million, but it is likely not precise.
I should say, I don't just blindly believe anything because of biases. My oldest, and still one of my closest friends, happens to be an immigrant from Turkey whose family moved here shortly before I was born. I just think it's important to acknowledge the horrors of our past, as it's important to understand our past, to learn from mistakes to create a better future.
I'm not really gonna take this any further than this, you seem like a wise enough person to not believe lies by any government.
Have a nice day