Technically speaking, it will absolutely take a change in thinking and heart and mind to accept something other than what you know as truth, for truth. However, that is not my goal when I speak to a person about the bible. It is not to say, I'm right and you're wrong and you are stupid if you stay how you are, to come off pompous. But it is to show that the bible is truly God's word, and to help others understand what his plans are. I fail to understand how trying to help others learn about the supreme being and maker of all things is a bad thing in any way. Even if it means they have to abandon what they know. How silly would that really be? To say to Jehovah, hey Jehovah, I know you exist and you wanna change things for the better for everyone, but this guy here is a buddisht and he is thinks he is doing just fine without you, so I will let not let him know what I know about you because he is fine how he is, even though if he does not know you he could possibly not recieve everlasting life?
If you were about to head into an establishment of some sort where there was immediate danger, maybe fatally, that you were unaware of because you were preoccupied with what you need to do while heading in there, and Im on the corner with knowledge that can possibly keep you from danger, and spare your life even, would you want me to let you proceed without saying anything, or warn you? Honest?
If you say warn you, now you know what Jehovah is trying to do for all mankind out of love. Save them.