The Gospel as it is proclaimed in the New Testament nowhere mentions the process whereby God created. It is never presented as a part of the Gospel message proclaimed by Christians in any way, shape, or form. It isn’t that it is “just a minor tenet” or something like that – it isn’t mentioned at all.
People held all sorts of views about the process of creation and the nature of the natural world in those times. And yet we have no record of any Christian proclaiming to pagans to believe different things about the makeup of the natural world, or anything else of that sort. Belief in God as Creator seems to have been enough for them.