Nothing is fact. The laws of physics are only a theory, it's only a theory that you exist, everything that has not been proven wrong is a theory. Many people claim to have scientific theories, a theory has to be proven correct. That means that not only can you give evidence of it, that evidence cannot be proven wrong. As such, every accepted theory can be relied upon to be accurate. What gaps does Evolution have? It essentially says that after life was created (it doesn't say how life was created) animals changed and adapted to fit their role better. Sharks, over time, developed better organs for hunting in water, birds developed better ways to fly etc. What hole is there in that? As for the big bang, it's simple. It says that since the universe is expanding (This is proven) if you simply 'roll back' the clock far enough the universe occupies a point smaller then the head of a pin, from which it expands. Where is the hole in that?
I'd say you're partially right. I don't know enough to say if space is curved or not, but if we assume that it's flat, then yes, the universe is infinite, but the part of it with matter in it is finite. If light started moving away from the centre of the universe as soon as the big bang happened (13.7 billion years ago), then the part of the universe with light in it is 13.7 billion lightyears across. 1 lightyear = 9.4605284 × 10^12 kilometres, so the part of the universe with light in it has a radius of 64 804 619 540 000 000 000 000km, or (40,267,723,690,676,291,680,000 miles). Beyond that is nothing, no light, no matter, no energy, nothing.

So you are partially right, the universe probably is endless, and expanding, but we do know how it started, and so we can figure out how much of it has 'stuff' in it.

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"Science is the poetry of reality." ~ Richard Dawkins