This juxaposition of abortion and war is ultimately unhelpful to forming a judgment about either one.
If “we” had no beginning, how is it you call God “our Source” or Creator?
I will try to answer that with an analogy - maybe not perfect but possibly helpful.
Numbers exist because of the principle of mathematics. Numbers conform to mathematical laws (2+2=4). Numbers have no restriction of where or when they exist - they did not begin at some point and will not end at some point. There is no limit as to where those numbers can manifest (become apparent) or in what form - there can be two (or whatever) galaxies, or comets, or planets or molecules, now, or a thousand years from now or before. The number 2 or 7 or whatever can manifest anywhere, any time. There is no limit to numbers (tell me what is the highest or lowest number). Numbers can not be destroyed (if you eliminate 2 of anything, did you eliminate the number 2?) Those numbers exist because of their source, mathematics. I believe there can be an analogy between that concept of mathematics and "its children", numbers, and God and His children, us. We are infinite in quantity; we are eternal; we have the potential to exist anywhere (spiritually) - we happen to be only aware of our existence here in this human, earthly environment but that does not mean there is not infinitely more.
In this analogy, the principle of mathematics "created" numbers. And God's Principle of Life "created" us. In both cases, that creation did not require limitations of time or space or material. When we speak of the spirit of something we are referring to its essence. Our essence is Spiritual, without limit and eternal.
To state it another way, we exist because God exists. God is eternal without beginning or ending, therefore so are we. God is the Cause and we are the effect. That is my proof of the existence of God. You can't have an effect without a Cause and there is no way human beings caused existence, we are a result of existence.