In answer to the question "Is Tipler's Omega Point theory a sham or does it have some scientific validity?": yes to the latter option. Physicist and mathematician Prof. Frank J. Tipler's Omega Point cosmology is a mathematical theorem per the known laws of physics (viz., the Second Law of Thermodynamics, General Relativity, and Quantum Mechanics), of which have been confirmed by every experiment to date. Hence, the only way to avoid the Omega Point Theorem is to reject empirical science. As Prof. Stephen Hawking wrote, "one cannot really argue with a mathematical theorem." (From p. 67 of Stephen Hawking, The Illustrated A Brief History of Time [New York, NY: Bantam Books, 1996; 1st ed., 1988].)
Prof. Tipler's Omega Point cosmology has been published and extensively peer-reviewed in leading physics journals. It is a proof (i.e., mathematical theorem) demonstrating that sapient life (in the form of, e.g., immortal superintelligent human-mind computer-uploads and artificial intelligences) is required by the known laws of physics to take control over all matter in the universe, for said life to eventually force the collapse of the universe, and for the computational resources of the universe (in terms of both processor speed and memory space) to diverge to infinity as the universe collapses into a final singularity, termed the Omega Point. Said Omega Point cosmology is also an intrinsic component of the Feynman-DeWitt-Weinberg quantum gravity/Standard Model Theory of Everything (TOE) correctly describing and unifying all the forces in physics, of which TOE is itself logically forced by the aforesaid known physical laws.
The Omega Point final singularity has all the unique properties (quiddities) claimed for God in the traditional religions. For much more on Prof. Tipler's Omega Point cosmology and the details on how it uniquely conforms to, and precisely matches, the cosmology described in the New Testament, see my following article, which also addresses the societal implications of the Omega Point cosmology:
Additionally, in the below resource are different sections which contain some helpful notes and commentary by me pertaining to multimedia wherein Prof. Tipler explains the Omega Point cosmology and the Feynman-DeWitt-Weinberg quantum gravity/Standard Model TOE.
* James Redford, "Video of Profs. Frank Tipler and Lawrence Krauss's Debate at Caltech: Can Physics Prove God and Christianity?", alt.sci.astro, Message-ID: jghev8tcbv02b6vn3uiq8jmelp7jijluqk[at sign]4ax[period]com , July 30, 2013,
Google Groups
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https://archive.is/a04w9
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The previous answerers Joshua Engel and Lee Witt both admitted in their responses that they know essentially nothing about Prof. Tipler's Omega Point cosmology, yet unfortunately they felt the compulsion to respond to this question.