How is this an alternative to anything? . My alternative is that we know nothing about how things came to be, but we have the human mind realising where it is, assessing where it is, and coming to conclusions.
Again it's not an alternative, it's a "we don't know"-statement. You just say we may not be right about the big bang, but don't propose some other model else instead.
Science isn't just pulling things out of thin air. I suspect that a lot of things are pulled out of thin air to get a research grant.
Of course you need to make good impression to get money for your research, and researchers are hardly to blame for this. Doesn't mean that all that comes out is hot air; peer-review sorts this out usually.