Greetings jmc,
Deuteronomy 30: 19 I call heaven and earth to record this day against you, that I have set before you life and death, blessing and cursing: therefore choose life, that both thou and thy seed may live:
You are right, the choice is yours...life or death.
As for Christians trying to change people, it's not up to us to change anyone but in fact it's up to us to give people a chance to change themselves. That chance is Jesus Christ who commanded us to preach the Gospel to all.
In His Name,
Eddie