Calling Jesus Alpha and Omega or First and Last is not a statement of ontology (that Jesus is literally God).
Jesus is the firstborn from the dead in that all who are saved are saved through him. All that have lived who will be saved, from the beginning to the end will be saved through Christ. God's plan from the beginning to the end was to reconcile all things through Christ. Jesus is first and last, beginning and end, alpha and omega, in a different sense than God is. Alpha and Omega can be applied to God himself or it can be applied to the centerpiece of God's plan. There are two major themes pertaining to the revelation of God throughout the Bible. God and God's plan to save the world through his Messiah. Luke 24:44 (ESV) "Then he said to them, “These are my words that I spoke to you while I was still with you, that everything written about me in the Law of Moses and the Prophets and the Psalms must be fulfilled.” Revelation 19:10 (ESV) "the testimony of Jesus is the spirit of prophecy." Ephesians 3:8-11 (ESV) "to preach to the Gentiles the unsearchable riches of Christ, and to bring to light for everyone what is the plan of the mystery hidden for ages in God, who created all things so that through the church the manifold wisdom of God might now be made known to the rulers and authorities in the heavenly places. This was according to the eternal purpose that he has realized in Christ Jesus our Lord." 1 Timothy 2:5-6 (ESV) "For there is one God, and there is one mediator between God and men, the man Christ Jesus, who gave himself as a ransom for all, which is the testimony given at the proper time."
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