How do you explain that catechumens can become martyrs, then? They were not baptized. According to your theory, allegedly they would not be able to do a perfect act of love towards God without baptism.
Catechumens usually had to learn the faith during a few years before being allowed to be baptized. Are you aware of how extremely common it was for catechumens living under the Roman empire's tyranny to die without being baptized? Why would priests take such a risk if baptism of blood didn't exist?
You either have no idea what you're talking about, are lying, have no faith, or are guilty of all three...
It is just as easy (even easier if you have the faith) to speculate that God provided Baptism to these catechumens before they died even if through an unseen miracle to supply His requisites for salvation, as it is to use our want of knowledge as proof of its dispensability. What we do not know is not a proof of anything.