YOU were the one that used the Marxist’s opinion to support your opinion. Again, it was opinion, not fact. The FACT is you used a Marxist’s opinion to support your opinion.
It was a statement of fact by a scientist who is also a marxist.
The FACT is that you so desperately want Lewontin's statement not to be a fact, that you will make any claim and say anything to avoid dealing with that fact.
Anyone who understands science can see that his statement is the simple conclusion of the fact that science is based on philosophical naturalism.
If this causes you problems, using the fallacy of personal attack against Lewontin does not help you.