Could be. The fire starting in two places would pretty much clinch it. On the other hand, I could imagine a fire seeming to start in two places but not actually doing so. Like if it started in one place and then were quickly channeled internally to another spot where it flared up. To me there’s not enough info to draw solid conclusions yet.
Having been through a Church fire, I agree that it may be possible to reach a higher degree of moral certainty. I’d rather hear it from a fire Marshal than a priest. The trick is getting particular knowledge and general expertise sufficiently together.