Most Evangelical Christians (including those within the Reformed camp) would not look to the book of Leviticus to derive its order of worship. Reformed Christians pride themselves on being a people who follow the Regulative Principle of Worship (i.e. we must only do what God commands us to do in worship), but when it comes to the rules for the RPW, we more often than not leave it within the confines of the New Covenant Scriptures.