Catholicism isnt pantheist nor is it polytheistic and to suggest that is the highest and most rank sectarian prejudice. You're entitled to your opinion but its erronious and unsupported by facts.
Most Christians aren't pantheist, but I've met enough who think in pantheistic terms that are less then comfortable and definitely not biblical. Secondly and I don't know if you caught onto this yet, I make jokes especially about things that if approached to seriously end in vehement arguments that neither enlighten or edify the individuals involved.
Finally Catholicism and polytheism, or should I say veneration of the saints. Let's start of with prayer, which is an integral part of worship being directed at saints, that's not biblical even in the slightest. The common counter argument being that Catholics don't actually pray to the saints, instead they ask for the saints to intercede on their behalf or to pray with them to God. The problem that arises is the fact that intercession and communion is the role and responsibility of the Holy Spirit, offering that to a saint is either disrespectful to God or elevating the importance of the saint sometime both.
Next on the list is the use of alters and idols in the veneration of saints. How many times did God admonish the Jews for making alters to other gods or bringing in idols from other countries. It's in the ten commandments, number two. No graven images of things of heaven or earth.
Finally Catholics have a pantheon of patron saints. St. Dunstan saint of the Blacksmiths, St. Catherine saint of artists, St. Florian saint of fisherman, ect and so on. That that's seems awfully similar to Greek pantheons whom had god's and demi-god's of the exact same people I listed. Let's not also forget the pantheistic god's of Europe who's worship was supposed to protect from natural disaster and to bless their daily lives.
So let's count the tally, prayer towards saints at alters with graven images for their blessing and protection. That sounds a lot like worship, and even if it's not expressed directed towards the saints it creates an uncomfortable level of familiarity for something that's no where to be found in the Bible and that has practices that are condemned in other portions. At worst it's christian flavored polytheism at best it's unnecessary practice that
I want to make it clear, I don't have anything against Catholicism, I still think the Catholic church is one of the greatest forces for good in the world, I admire the fact that after hundreds of years it functionally maintained a level of unity that protestant churches have never found possible. I Believe Catholics to be Christians and I'm certain as I can be that they have place in heaven waiting for them no better or worse then any other Christians. I don't even think this is that big of deal I know there are far more important issues going on in the church that should be dealt with. But I'm not going to ignore bad theology and tradition because of those things.
I going to apologize if i came off sounding harsh it's not intentional, it's two in the morning here and i should already be in bed and I might be a wee bit cranky.