good point, at least we have good evidence of the Big Bang, but we have no idea what happened before the Big Bang and why it happened in the first place, but those questions are meta-physical, pure speculation, non-scientific in the sense that we cannot test theories that are outside of our universe.
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I agree, but it's still mathematically consistent. Many cosmologists regard the Big Bang as an open boundary, so there are both models of the universe with a beginning and models of eternal universes. Also, as a general principle, metaphysics should conform to physics, so it's not unscientific necessarily. Anyway, the main point was that actual infinities might exist and it's a widely accepted view among the experts in the relevant fields. Thanks for bringing up this topic.