Many smart skeptics reach for the multiverse to escape the fine-tuning argument. It's worth understanding why this move doesn't work as well as it appears.
The claim
Infinite (or vast numbers of) universes exist with different physical constants. We observe one in which the constants happen to support life. No designer needed.
Sounds reasonable. Until you press on it.
Problem 1: There is no direct evidence
By definition, other universes cannot be observed from inside ours. The multiverse is a hypothesis without empirical confirmation, and arguably without the possibility of confirmation. Physicist George F.R. Ellis (longtime collaborator with Stephen Hawking) has argued at length that multiverse claims fail the basic test of being science: they are unfalsifiable.
Problem 2: The multiverse requires its own fine-tuning
Whatever mechanism generates universes must itself have specific properties. If it generates universes with random constants, the generator itself must be calibrated. Robin Collins's point: you have moved the fine-tuning up one level, not eliminated it.
Problem 3: Most multiverse models still require a beginning
The Borde-Guth-Vilenkin theorem (2003) shows that any expanding multiverse must have a past boundary — a beginning. Vilenkin himself: "All the evidence we have says that the universe had a beginning." A finite multiverse still needs an explanation for its origin.
Problem 4: The trade is bad
To avoid one Designer, you postulate infinite universes you cannot see and cannot test. Occam's Razor cuts the opposite way.
Problem 5: An infinite multiverse generates absurdities
If infinite universes exist with all possible variations, then somewhere there is a universe identical to ours except your shirt is blue. Somewhere a "Boltzmann brain" fluctuates into existence with false memories of being you. Somewhere every conceivable history plays out. Many philosophers consider this a reductio ad absurdum.
Problem 6: The deeper question remains
Even if a multiverse exists, why is there a multiverse rather than nothing? Why does the multiverse-generating mechanism exist? The Christian answer (a necessary, eternal God) still stands as the better candidate for an ultimate explanation. The multiverse explains some things; it does not explain existence itself.
William Lane Craig's summary
"Even if a multiverse exists, it cannot dispense with the need for a transcendent cause."
Stephen Meyer's broader case
In Return of the God Hypothesis, Meyer argues that intelligent design is the best explanation for three converging discoveries: the beginning of the universe, the fine-tuning of physics, and the information in DNA. The multiverse cannot address all three.
The Orthodox lens
Christian theology has always confessed God as the explanation that goes "all the way down" — uncaused, necessary, eternal, the source of all that is. We do not need to multiply unobservable universes to explain why ours is the way it is. We have a better candidate. He has a name.
A pastoral word
The multiverse is a fascinating idea and may yet have scientific merit. But as an escape from the design argument, it is more an act of faith than an act of science. The Christian who points to a Designer is not less rigorous; he is following the evidence where it goes.