I can appreciate that what you say would make perfect sense and would be a great way to think IF God were not real and true, and IF truth really was merely subjective. But since God is real and true and he himself is in fact truth, it doesn't benefit us to perceive of ultimate, absolute truth as any subjective thing. To just each believe whatever we want is harmful in many situations that require action: If we have cancer, but wish we did not and so we choose to believe we do not, then we will not get needed treatment and live; If our house is about to explode, but we wish it were not so we choose to believe it is not, then we will not get out of the house and live.
If a doctor tells you that you have cancer, they are not evil for it; If someone tells you your house is about to explode, they are not evil for it. In fact it is the one who knows you have cancer or knows your house is going to explode, yet says nothing, who is actually acting in an evil manner. Likewise, those who tell you your spiritual action is required - receipt of the free gift of eternal life is necessary to make it go into effect for you - are the ones who are trying to benefit you and who truly care about you. Even if you do not agree, and you think it leads to conflicts (which it does), can you at least see that to truly believe and care means the believer will attempt to alert you to what they see as a dangerous situation and attempt to show you how to escape and live?
Unlike absolute truth, there is truth that is subjective by God's design and we are free to find our own truth in these areas. So truth for one may be that classical music is beautiful, while truth for another is that hard rock is excellent, and truth for yet another is that both are glorious. God has so wonderfully made us to each be who we are and to appreciate differing things, which are all valuable because of their value to one or another person.