"Since matter and energy cannot be created or destroyed, and they exist right now, the logical conclusion is that they have always existed. Do we know for a fact that they have always existed? No, but that's the best explanation we have right now."
Matter and energy can't always exist. The law of entropy says usable energy decreases over time. So if matter and energy always existed, the universe would be in heat death by now.
"I haven't forgotten about your other question. I haven't replied to it yet because that reply will take longer and work is keeping me busy."
Ah. Understandable.