“Specifically why do you believe finding consciousness or sentient is more plausible than a spiritual being?”
Without getting too deep into semantics, I don’t see a difference.
“Maybe the spiritual being is in another dimension and if science has the key to unlock it they could.”
When dealing with science, it’s often a matter of “yet”. We didn’t always have transistors back when we built the code-breaking computers of WWII, but now most of us have a few million of them in our pocket.
“And you believe science will find sentient, or be able to recreate it in dogs, horses, etc.?”
I believe the former to be possible and the latter will likely eventually become possible at some future point in time.