What is the total number of saints listed in the christian world ?

Answer 1

That would be hard to count, because, according to the New Testament, every believer, every forgiven sinner, is called a saint by God.
(Those called saints by some church leaders - that doesn't count).

Answer 2

At a bare minimum, two for EACH DAY of the Catholic calendar year [one male and one female]...

But it's always best to check their "active" file under Litany.

Peace be with you.

Answer 3

144,000