Saturday is not the only jewish sabbath. Do you keep all jewish sabbaths or just the ones you like?
Your ignorance is showing, there is no such thing as a "Jewish" Sabbath...
Gen 2:1 Thus the heavens and the earth were finished, and all the host of them.
Gen 2:2 And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
Gen 2:3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
Exo 31:12 And the
LORD spake unto Moses, saying,
Exo 31:13 Speak thou also unto the children of Israel, saying, Verily
my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you.
Lev 19:3 Ye shall fear every man his mother, and his father, and keep
my sabbaths: I am the LORD your God.
Exo 20:9 Six days shalt thou labour, and do all thy work:
Exo 20:10 But the seventh day is the
sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
Exo 20:11 For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the
LORD blessed the sabbath day, and hallowed it.
Lev 23:1 And the LORD spake unto Moses, saying,
Lev 23:2 Speak unto the children of Israel, and say unto them,
Concerning the feasts of the LORD, which ye shall proclaim to be holy convocations,
even these are my feasts.
Lev 23:3 Six days shall work be done: but the seventh day is the sabbath of rest, an holy convocation; ye shall do no work therein:
it is the sabbath of the LORD in all your dwellings.
And yes, I keep the annual Holydays as well as the weekly Sabbath.