[SpeakerToAnimals]

but is there any orders from God that the services should be held on Saturday?

Yes. Starting in Genesis chapter two. Jesus was a Jew. He went to the Tabernacle on the Sabbath, as was his custom. He kept the Passover the night before he was crucified.

[Salvation]

Christ fulfilled the Old Testament. This person needs to search for a New Testament Church that proclaims Christ.

[ravenwolf]

He went to the Tabernacle on the Sabbath, as was his custom.

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Yes, Jesus observed the Sabbath but not always in the ceremonial fashion.

Mark 2
23 And it came to pass, that he went through the corn fields on the sabbath day; and his disciples began, as they went, to pluck the ears of corn.

He kept the Passover which would have been on Thursday night.

Also Genesis chapter two says nothing about ceremonial at all but only rest, meaning it is your day to get away from the grind stone,

Mark 2
27 And he said unto them, The sabbath was made for man, and not man for the sabbath: 28 Therefore the Son of man is Lord also of the sabbath.