Martin luther's opposition to the authority of the pope and his questioning of the doctrine of salvation were considered heresy. on which of these issues did luther agree with the catholic church?

The sacraments of baptism and the Eucharist.

Luther agreed that baptism and the Eucharist were sacraments because they have visible signs; water and the bread and wine. However, having referred to the pope publicly as the Antichrist and pointing out abuses of the Church, it was only a short time before he was excommunicated and branded a heretic.

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they wanted the u.s. to fight on the side of the central powers.