Then cling to your belief.
The clear evidence in scripture that ONE man and ONE woman, married; is the IDEAL; although multiples were permitted.
The burden of proof is on you, not me. Show me where scripture says one man and one woman is ideal. It doesn’t. If your argument about Adam and Eve is what you are basing your supposition on, then you are saying unmarried folks are in the same position as polygynists.
I cling to my belief because I can support my stance in scripture. In that circumstance, this is justified.