Just because he wrote that, doesn't mean that everyone who thinks religion is unfalsifiable is a Marxist.
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Marxism is not just about the claim that religion is an illusion.
No it just means they have some Marxist inclinations. That they agree with Marx on some issues. A true Marxist is someone who agrees with Marx on all or most issues.
Thus you iamnotback have some Marxist inclinations but since you disagree with Marx on many other issues you are most definitely not a Marxist
