How is ignoring clear Biblical instructions in Leviticus justified?

> **Leviticus 11:7-8** > > And the pig, though it has a split hood completely divided, does not > chew the cud; it is unclean for you. You must not eat their meat or > touch their carcasses; they are unclean for you. > **Leviticus 11:11-12** > > And since you are to detest them, you must not eat their meat ad you must detest their carcasses. Anything living in the water that does not have fins and scales is detestable to you. > **Leviticus 11:19** > > Do not wear clothing woven of two kinds of material. I haven't come across many Christians that campaign against the eating of bacon, the eating of lobsters/squid or that refuse to wear clothes made of mixtures of cotton and wool. If a believer doesn't follow every instruction, how do they decide which to follow? *Note: I must credit the excellent book "The Philosophy Gym" by Stephen Law, from which these examples are taken*