What amazes me is that some people think that God Almighty, the most powerful, was in somebody's womb and came out of her vagina and was breastfed and was cleaned after and needed help survive.

and then die on a cross for our sense.

For God so loved the world that he gave his one and only son that whoever believes in him shall not Parrish but have eternal life for God did not send his son into the world to condemn the world but to save it to him

And your question on how does one equal to three I am it's called the Trinity and it's gotten three persons got the father God the son and God the Holy Spirit they're all God

so according to you God send himself as man to save us from himself by killing and sacrifice himself because of a law he himself made. This is an other issue that doesn’t make sense that you can add to three equal to one.

and also he don’t care about forgiving sins as much as he care about believing the fact that he sacrifice his own son. if you don’t believe in this story that doesn’t make any sense, your sins are not forgiven. are you really believing this man made story about God?

in islam , god is one and has the power to forgive any time and he sent prophets to all nations. Jesus peace be upon him was a prophet but people have changed his story. then the last prophet mohamed peace be upon him came to correct this misconception about God