Why religious philosophies are so competitive with each other?

Question

Historically, most human slaughter has resulted because of the competitiveness of religious dogmas. Why?

Answer 1

Church = power = money.

Two of the things people fight about the most.

Answer 2

The premise of your question is incorrect. All human conflict is about power, either the power over others or over resources. The fact that a religion is often used as an aegis for that power-hunger is incidental. If there was no such thing as religion the power-hungry would find another reason to enslave their fellows or murder them for their stuff.