Catholics pray to the Virgin Mary. The Bible does not tell Christians to do that, nor do we.
Catholics confess their sins to a priest. The Bible does not tell Christians to do that, nor do we.
Jesus told us to confess our sins to God in His [Jesus'] Name, and that we were then forgiven. Period. The very concept that "ten Our Fathers and three Hail Marys" might accomplish some form of absolution is a heathen teaching that Salvation can be accomplished through human works, which the Bible is clear it cannot.
Jesus teaches us in the Bible that baptism is a conscious choice of public acknowledgement, a public display, of our Faith in Him, and that "a man must be born a second time of the water [baptism]" to have Eternal Life.
Catholicism preaches the existence of "pergatory" The Bible does not.
That so much of Catholic ritual directly contradicts Christ's own verbatim teachings should speak volumes to you. I pray one day that it will.
For the time being, let's differentiate more specifically between "Catholics" and "Protestant Christians."
See what I mean? Even within your religion you believe the others are not following God's wishes and likely you think other differently-believing Christians will not be saved. Now think of when this goes public, directly showing the government prefers one form of Christianity over another.
It's not the atheists you necessarily have to worry about, but other theists.