Worship is an Offering...but how?

So if worship is an offering, does it matter how it is offered? Does God receive any offering from any person? Can an unbeliever in the Lord Jesus Christ, one who does not receive Him as the raised-from-the-dead, living, Son of God, deity Messiah...can he or she worship God?

Does it matter if worship is not presented in Christ? He says that He is looking for true worshipers, those who will worship in Spirit and Truth. So what does this mean?

If worship is an offering, we must understand how it must be offered. I am interested in your biblical, Christ-focused comments on this topic.

Christ is all.