You don't beleive that God created the distinct animals, therefore logic forces you to believe that macroevolutionary changes do occur. Starting from my base, it isn't logically necessary for macroevolution to have occured.
Unfortunately, the Bible says that God did NOT create the distinct animals in the way they actually appeared over time. The Bible spells out one 6 day creation event (actually less than 6 days for living things). When Bible believing geologists first began to study the actual geology they realized this wasn't right. One thing that they then postulated was a series of "special creations" in order to have God creating the animals but still explain what they saw.
Unfortunately, over time this began to look more and more silly as it became clear that new forms arose again and again and again over long periods of time. It meant that there had to be constant "special creations" going on.
There don't seem to be many people who want to say that "special creation" is going on today which is where you end up by following this path.
The question is, will you be willing to abandon it for another theory when the evidence shows it may be in error?
Of course, that is what science is about. However, it is near enough to a dead certainty that what the new evidence will change (if anything) is the mechanisms for "macroevolution" will be understood differently. That is has occured is pretty darn unlikely to be overturned.
It would be interesting for you to speculate on what new evidence might turn up.
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