Sorry....no cigar. Acts 10 does not even remotely suggest such a thing.
Revelation 18:2] And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
This is sixty years after the resurrection and at least fifty years after Peter's visit to Cornelius. Why on Earth would John be referring to an "edible bird" (in your opinion) as unclean?
I'm not a Seventh Day Adventist......and as far as I know, they do not observe the Dietary Regulations of [Leviticus 11].
You're batting "0"!
I didn’t write the Bible. I’m just telling you what it says.
9 About noon the following day as they were on their journey and approaching the city, Peter went up on the roof to pray. 10 He became hungry and wanted something to eat, and while the meal was being prepared, he fell into a trance. 11 He saw heaven opened and something like a large sheet being let down to earth by its four corners. 12 It contained all kinds of four-footed animals, as well as reptiles and birds. 13 Then a voice told him, “Get up, Peter. Kill and eat.”
14 “Surely not, Lord!” Peter replied. “I have never eaten anything impure or unclean.”
15 The voice spoke to him a second time, “Do not call anything impure that God has made clean.”
16 This happened three times, and immediately the sheet was taken back to heaven.