Your style of argument is rhetorical rather than logical, and so, lacking logic, based more on personal conviction than arguable points. Viz:
As we observe the universe, we observe life in plants, animals and rational beings.
A good start. Yes, we do.
What caused these properties – life, intelligence, reason – to reside in these beings? Rightly leaving imagination aside, one asks, What can explain the presence of these properties? Good question. I ask you, What have you observed?
But a poor continuation. If you have an argument, present it, don’t ask questions.
Has anyone observed non-life beget life?
Has anyone observed the unintelligent being beget an intelligence being?
Has anyone observed an intelligent being beget a rational being?
I’ve no idea. Have you? If so, then say so, don’t ask your interlocutor to do your reasoning for you.
If not, then the properties of existence, life, intelligence and reason must reside in the first cause.
Well, no, obviously. Your conclusion is not consequential to your argument. Just because no-one has observed non-life beget life, that does not mean that life must “reside in the first cause”. You may argue that “the possibility that life may arise” must precede “the arrival of life”, in which case I completely agree with you, but that does not mean that the ‘first cause’ was alive. And yes, “the possibility that intelligence may arise” must precede “the arrival of intelligence”, but that does not mean that the ‘first cause’ was intelligent.
And “the possibility that photosynthesis may arise” must precede “the arrival of photosynthesis”, but that does not mean that the ‘first cause’ was a plant.