FuzzyBunny116:
At our church we have a statue of Jesus and Mary on the walls, and even a small little statue/shrine/garden to her. I brought a friend who’s Methodist and he says it’s easy to see why people think Catholics worship Mary
Point out that compared to a Methodist church (zero statues), there will surely be more statues of Mary in a Catholic church! So they stand out more to your friend than they do to a Catholic. Also, since Jesus is fully there in the tabernacle, there is less of an urge to have assorted statues or pictures of him about. Often there will only be the crucifix at the front, a great reminder, and maybe one other assorted Jesus statue. But the red light and gold box are there in the front, and everyone genuflects to Jesus when they go by or enter the pew, etc. He is our focus in the church area. We kneel and immediately talk to him!
Also point out what two items are carried in during the procession. (the gospels…a crucifix…)
Perhaps you could count how many times we refer to Jesus during mass, and also how many times Mary (okay, don’t do this on the feast of the assumption or something

). Jesus takes center stage big-time. More for Jesus should not mean nothing for his mother, however!
Oh, often Protestants have lots of pictures of Jesus in their church facilities, like one in each sunday school room. Maybe that is what your friend is missing. Remind him of Jesus in the tabernacle, and all those crucifixes we have floating about in our homes and schoolrooms. He may simply overlook them as foreign (they only use the cross).