The relevance of Marxism to science is that it removes it from its imagined position of complete detachment and shows it as a part but a critically important part of economy and social development.
For some years I deserted religion in favour of Marxism. The republic of goodness seemed more attainable than the Kingdom of God.
What guides Marxism then is a different model of society and a different conception of the function of the knowledge that can be produced by society and acquired from it.
An excessive knowledge of Marxism is a sign of a misspent youth.
I think there ought to be a strict separation or wall built between our religious faith and our practice of political authority in office. I don't think the President of the United States should extoll Christianity if he happens to be a Christian at the expense of Judaism Islam or other faiths.