I don't want to offend anyone on this board, but this is just something that I've observed. I may be wrong and am teachable. Just my opinions based on experiences
I'm sure that there are many Catholics that are genuine Christians and true believers. But, I have noticed a few things in the Catholic faith that I find strikingly similar to witchcraft and paganism.
The Bible never tells us anywhere to worship saints, or the Virgin Mary, or bow down to idols. I'm not sure about when they cross their hands over their hearts.

I'm not sure if that's unBiblical or not. The Bible tells us to model our life like great men and women of God, but never to worship them.
Secondly, I've met many Catholics that have converted to non-denominational Christianity. These are the following reasons I've heard (none of them Biblical).
1. A woman was divorced and was thereafter not allowed to worship in the church anymore b/c she was unclean.
2. You are not allowed to read the Bible yourself. You must consult a priest for all of your advice and have him interpret the Bible for you.
3. The worship of idols.
Now honestly, my opinion is that the only problem with the Catholic Church is that it's been corrupted by man's selfish desires to control and mandate. So now instead of basing their ideas and practices solely on the Bible, they base them on tradition and mandate. That to me is not Biblical.
To follow are the 10 Commandments and Some Biblical Teaching About Witchcraft and Sorcery (NIV Version). You were very right to question these practices of your friends. It shows discernment.
Your friends' behaviour is definately not Christian. It sounds very pagan to me. And I think many of the practices of the Catholic church can be a gateway to someone who is not well versed Biblically and attracted to the sin of idolatry. Remember to pray without ceasing. God Bless You. Merry Christmas
Exodus 20
The Ten Commandments
1 And God spoke all these words:
2 "I am the LORD your God, who brought you out of Egypt, out of the land of slavery.
3 "You shall have no other gods before [a] me.
4 "You shall not make for yourself an idol in the form of anything in heaven above or on the earth beneath or in the waters below. 5 You shall not bow down to them or worship them; for I, the LORD your God, am a jealous God, punishing the children for the sin of the fathers to the third and fourth generation of those who hate me, 6 but showing love to a thousand {generations} of those who love me and keep my commandments.
7 "You shall not misuse the name of the LORD your God, for the LORD will not hold anyone guiltless who misuses his name.
8 "Remember the Sabbath day by keeping it holy. 9 Six days you shall labor and do all your work, 10 but the seventh day is a Sabbath to the LORD your God. On it you shall not do any work, neither you, nor your son or daughter, nor your manservant or maidservant, nor your animals, nor the alien within your gates. 11 For in six days the LORD made the heavens and the earth, the sea, and all that is in them, but he rested on the seventh day. Therefore the LORD blessed the Sabbath day and made it holy.
12 "Honor your father and your mother, so that you may live long in the land the LORD your God is giving you.
13 "You shall not murder.
14 "You shall not commit adultery.
15 "You shall not steal.
16 "You shall not give false testimony against your neighbor.
17 "You shall not covet your neighbor's house. You shall not covet your neighbor's wife, or his manservant or maidservant, his ox or donkey, or anything that belongs to your neighbor."
Deuteronomy 18:10 10 Let no one be found among you who sacrifices his son or daughter in [a] the fire, who practices divination or sorcery, interprets omens, engages in witchcraft,
2 Kings 9:22
22 When Joram saw Jehu he asked, "Have you come in peace, Jehu?"
"How can there be peace," Jehu replied, "as long as all the idolatry and witchcraft of your mother Jezebel abound?"
2 Chronicles 33:6
6 He sacrificed his sons in [a] the fire in the Valley of Ben Hinnom, practiced sorcery, divination and witchcraft, and consulted mediums and spiritists. He did much evil in the eyes of the LORD, provoking him to anger.
Micah 5:12-14
12 I will destroy your witchcraft
and you will no longer cast spells.
13 I will destroy your carved images
and your sacred stones from among you;
you will no longer bow down
to the work of your hands. 14 I will uproot from among you your Asherah poles [g]
and demolish your cities.