Nicole, you are bringing up a lot of interesting topics (at least to me) since you joined us. It's refreshing!
I think there is a difference between the words "religion" and "denomination". To me "religion" is something like Christianity, Budism, Islam, etc, where the core beliefs and values of each are not compatible with each other. Denominations are different groups within the same religion, ie Methodist, Baptist, etc. where they have different ways of doing things, but their core beliefs still reflect the religion as a whole. I.e., in Christianity, a denomination will still testify that Jesus is the son of God the Father, was sacrificed to pay for our sins, and His sacrifice is the only way to a relationship with God the Father.
To the question of is there one right "religion", I would have to answer that Christianity is the one right religion since we are taught that no one goes to God except through the Son, Jesus Christ. But I think you are probably meaning to ask more about denominations than religions. I've found all denominations I've been involved with over the years (including "non-denominational" churches) have good and bad points. The key is to look directly to scripture, and believe scripture over denominational doctrine.
You are in a part of the world heavily influenced by the Catholic church. Indeed they believe in praying to Mary and even worshiping her as God. Did you watch the funeral of the previous Pope and notice the large "M" on his casket? That is a symbol for Mary, and the fact that it was the only symbol he chose to have on his casket spoke volumes about who he worshiped. Pope Paul had a lot of good points, and did a lot of good things for the Catholic church in his life, but he was well documented as a devout "marist" (someone who worships Mary as God).
Some denominations have differing beliefs on relatively minor issues (such as whether to use wine or grape juice for communion), but when it comes to worshiping someone other than who scripture tells us we should worship, I have to question if this is still part of the "Christian" religion!