Yes and no. As Paul made clear in Hebrews, there were certain things that only pertained to the Levitical priesthood:
Heb 7:11 Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?
Heb 7:12 For when the priesthood is changed, of necessity there takes place a change of law also.
Primary among these changes was animal and/or grain sacrifices. In chapters 9 and 10 Paul clearly explains the purpose of animal sacrifices and how the sacrifice of Christ is the only sacrifice for sin we (Christians) need:
Heb 10:3 But in those sacrifices there is a remembrance again made of sins every year.
Heb 10:4 For it is not possible that the blood of bulls and of goats should take away sins.
There are other laws and regulations which can ONLY be applied on a national basis and were thus only applicable to Israel as a nation.
What most do is to go beyond these things and suppose that anything contained in the books of the "old testament" are not applicable to Christians.
And how does one decide which is which?