Hi Anyonghaseyo,
Although I’m a Catholic Christian, I have been in your situation, when a very Baptist friend & co-worker tried to show me the error of my idolatrous Popish ways… 
It was really irritating, and made me less likely to give him a fair hearing…
So I would like to suggest you try a version of the following:
*"Look, your constantly talking to me about your faith is only going to annoy me / alienate me to the point that you will be / are pushing me away. If you want to try to convert me, just try to lead a life that is so Christ-like, so loving, and so fullfilled, that I will want access to what you have.
If I buy it, then I will ask you about it. *
Saint Fancis of Assisi <spelling?> said: One must preach the Gospel at all times, and sometimes, even by saying something…
Meaning that a Christian should preach by example, not so much by word. Hopefully, that will help both you and them.
In any case, I think it’s kind of simplistic of them trying to drag you to a service, where you’re likely to feel like a fish out of water. Church is more for folks who already are Christians to strengthen and deepen their faith. From a Christian perspective, God can come into your heart any time, any place, and doesn’t need anybody else’s help, except yours.
Unfortunately, many of us try to “recuit” others more to feed our own egos and acquire status in the church community than to genuinely share what we have. If I can, I would like to offer you an apology on their behalf, if this is the case…
Best of luck, and happy Thanksgiving.