Thank you for the great comment. Yes, suicide is a major killer of humanity but it is one that even a potential immortal can perform. Even immortals can end their own lives. In a way, it isn't a "natural" factor.
"I do believe that life has no meaning without God not death"
That's because you're a religious person. People that have no religion or belief in "God" or any deity still value their very short time here. To an extent, a belief in God reduces the value of life since, at least in the Abrahamic religions, and if you qualify, there is a promise of "Eternal Life". Meanwhile those without belief in such a promise will tend to value the here and now.
"Do not love this world nor the things it offers you, for when you love the world, you do not have the love of the Father in you." - 1 John 2:15