Not at all, it is quite an easy thing to distinguish people from the religion they adhere to. For example I know many kind people who are Muslim. Yet I utterly reject the poison inherent in their religion which commands them to murder those who convert to other faiths. Or to levy heavy taxes on those who are Christians.
Now, it is the elements that are of evil origin that are abominable, but the people are not. On the contrary, they are to be pitied for being enslaved to such a diabolical mindset.
However, let us examine the metaphor of the poisoned wine in greater detail-
It is entirely possible, in the abstract, to appreciate a poisoned wine.
For example, I enjoy a good dry red wine. I can look at the brand which is poured into the goblet, I can admire what I know about it, and I can say it is an objectively good wine considered in itself. There is nothing objectionable in it.
Likewise I can look at a false religion and admire, say the works of Charity, the personal devotion, the sincerity called for, and many other positive elements.
But apart from this abstraction, which can only be an intellectual exercise, the reality remains- the drink has been poisoned by error, and the poison has utterly permeated it. It is inseperable from the good wine, and totally corrupts it. The only
Solution is to pour out the poisoned wine and accept pure water from the living wellspring of life.
Everyone is welcome to that, and the offer is an act of mercy. But only for those who are willing not to drink poisoned wine.