I realised today that while I believe there was a big bang at the start of the universe, I have never seen the proof for a big bang. I have just heard  that scientist believe there was a big bang.
Similarly, while I think animals evolve, I have never seen the proof for evolution, just that scientist think evolution occurs.
So what exactly would it take for a normal person to see the proof for big bang and for evolution, or at least see enough proof to go, "Oh so that's why..." ? None of us really have time or resources in our lives to become a physicist, an evolutionary biologist , or a theologian that easily..
So here are your choices:
1. Believe what scientists say, without ever seeing the proof, just because they are scientists.
2. Believe what your favourite religion says, because that's what seems right.
3. Become a theologian.
4. Become a scientist.
5. Don't care about the big questions at all, and live life without ever worrying about why.
6. Relapse into the awesome world of Descarte's skeptisicism.
7. Become a mathematician. Then whatever you say will be utterly useless in answering the 'why's', but at least what you say will be logical.