I posted some icons of Jesus and Mary at my desk at work, and my co-worker asked me if I’m Catholic. I said, “Not really [which is true, haven’t been confirmed in the Catholic Church] but I go to Catholic Mass. I used to be Protestant.”
Then he invited me to his evangelical church and gave me a card for his church.
He asked me why I decided to go to Catholic Church, and I couldn’t really say, “Because I believe it’s the true Church,” without causing offense, so I just said, “It felt more at home.”
How do I politely decline an invitation to another church without offending someone?
Just say, “No, but thank you for inviting me.”
The bigger deal you make out of this, the bigger deal your co-worker will make out of it. Just keep it simple, and say, “No, thank you.” That’s polite but firm.
Because I am a convert to Catholicism from Evangelical Protestantism, I can tell you that your co-worker has everyone in his church praying for your “conversion” to Jesus Christ. So he will keep bothering you and giving you tracts, inviting you to Christian concerts and events at his church, and trying to hold discussions with you.
If your co-worker continues to bother you about this, you could politely tell him that you would prefer not to discuss this at work, and that he could get in trouble for creating a hostile work environment by bringing up religious topics.
HOWEVER…you yourself are in danger of having the same accusation made against you, and unfortunately, there is hard evidence that an accuser could use against. you. Those icons in your workspace could be used against you. I suggest that put your icons away at work. You are making it too easy for another worker to accuse you of creating a hostile work environment for them, and that could mean the end of your job.
The Lord tells us not to deny Him, but the Lord does not command us to display visible signs of our faith. He says that the world will know we are Christians by our love. IMO, risking your job is not “love.”
Based on my personal experience and conversion experience, I can assure you that the BEST way to witness of Catholicism to your Evangelical Protestant co-worker is to constantly demonstrate love to him. Anyone can argue apologetics for any “religion.” But constant love, year after year–that’s a true witness of Jesus Christ and His Church.
Godspeed to you!