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Sounds like God is serious about a lot of things,

Yes

Genesis 17:

And when Abram was ninety years old and nine, the LORD appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect (תָמִֽים׃).
And I will make my covenant between me and thee, and will multiply thee exceedingly.
And Abram fell on his face: and God talked with him, saying,
As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.
Neither shall thy name any more be called Abram, but thy name shall be Abraham; for a father of many nations have I made thee.
And I will make thee exceeding fruitful, and I will make nations of thee, and kings shall come out of thee.
And I will establish my covenant between me and thee and thy seed after thee in their generations for an everlasting covenant, to be a God unto thee, and to thy seed after thee.
And I will give unto thee, and to thy seed after thee, the land wherein thou art a stranger, all the land of Canaan, for an everlasting possession; and I will be their God.
And God said unto Abraham, Thou shalt keep my covenant therefore, thou, and thy seed after thee in their generations.
This is my covenant, which ye shall keep, between me and you and thy seed after thee; Every man child among you shall be circumcised.
And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed.
He that is born in thy house, and he that is bought with thy money, must needs be circumcised: and my covenant shall be in your flesh for an everlasting covenant.
And the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant.