the reason for the connection of Marx to Hegel is that Hegel supposedly came up with the idea that there's a thesis, and then there's an antithesis, and they form a synthesis, and supposedly somehow the Marxist esachaton is the synthesis of pre-industrial and industrial modes of production.
People also say Marx somehow turned Hegel's ideas around in the same way they say Hitler took the swastika from the peaceful Buddhists and flipped it over.
In reality, Marx was against Christianity. Christians believe that no one knows when the end times are and no one should even try to predict when the end times are, and no one knows how many will be saved. Marxists believe that Heaven is pie in the sky when you die and instead of striving to be a good person you should put all your effort into overthrowing capitalism and creating communism.
Christians believe that the poor we will always have with us. Marxists believe that the poor are created by the rich alienating them from the fruits of their labor. Christians agree that depriving the working man of his wages is a sin that cries out to Heaven for vengeance, but Marxists aren't interested in justice, they want "social and economic justice" to be established through redistribution, i.e. theft. Of course, right now, there are rich people who steal everything from the poor, but since those rich people say all the right things and the poor have "White privilege", Marxists side with the rich.
Archbishop Fulton Sheen had a lot of things to say about communism 50 years ago, in vids like https://www.youtube.com/watch?v=K8qqZup3Bg4