So you cannot answer the question of where life began or the first mutation or any examples of one species evolving into another, but you know it’s true. I admire your infinite faith.
Faith has nothing to do with it. First of all, I know life began somehow, at some point—that’s obvious. So yes, I believe it’s true that life began. As for what happened after that: I’ve seen enough evidence of evolution (including evidence of multiple species sharing common ancestors, a somewhat more accurate phrase than yours) to have a high level of confidence in the theory. That’s all.
But science is not about "faith", not ever.
It's about facts we know for sure, and hypotheses we use to explain them.
No hypothesis is ever accepted "on faith", but only as a result of strongly confirming data, after which we call it a "theory", such as the theory of evolution.
Evolution theory has been confirmed innumerable times and has never been seriously falsified, but that still does not make it a "belief" or "faith", because, it will be overturned if or when new data is discovered which proves it wrong.
That's how science works, but no such "proof" has been forthcoming, yet.