Acts 2:36 - “Therefore let all the house of Israel know...

Acts 2:36 - “Therefore let all the house of Israel know assuredly that God has made this Jesus, whom you crucified, both Lord and Christ.”

So, he is Lord under The LORD and that does zero to support he is God.

"He inferred that Jesus was the cause of Creation and so on."

ONLY in the true context that I showed you, which leaves no question about it, Jesus had no hands on literally in creation.

"So you tell me where this belief of Jesus being God came from."

From the CC's and from the best I can track down, it began to get legs around the 100's and effectively sealed in concrete between the 3 - 400's.

Your other comments, are not related to the claim of Jesus being God.