Isaiah 44
5 One shall say, I [am] the LORD'S; and another shall call [himself] by the name of Jacob; and another shall subscribe [with] his hand unto the LORD, and surname [himself] by the name of Israel.
About whom is Isaiah prophesying in stating people will call themselves of the Lord (Yahweh), and by the name of Jacob, and surnaming himself by the name of Israel? Please tell me, from 44:5
6 Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I [am] the first, and I [am] the last; and beside me [there is] no God.
The Lord (Yahweh) is King of Israel and the redeemer is the Lord of hosts. Yet He is the First and the Last, and beside Him there is no other god. The Alpha and the Omega is Yeshua (Jesus.)
Do the denominations teach all of the Word? Read the Word, all of it, trust Yeshua, and worship Him, for He died for you.