Part of bettering yourself also envolves how you react towards and treat your fellow man.
We cannot strive to be better and at the same time mistreat others, so you are absolutly wrong in thinking its all about me me me in Buddhism.
I know you are right. Actually, oversimplifications more times than not are the same as lies.
Be that as it may, I am trying to draw some comparisons (without putting in the time) between Buddhism and Christianity.
I do not believe God cannot be known.
I do not believe God would not communicate to His creation what our primary purpose for existence is.
I believe Jesus is the Son of God who summed up all the laws in two commands: Love God with all your heart, with all your souls, with all your strength. And, Love your neighbor as yourself. The emphasis is on God and others, not self.
I do not see any religion that charitable or altruistic to the most needy or most impoverished across the planet, across history, anywhere near to what Christianity has been. Christianity has sacrificed all for the care of others. This is the evidence people demand to show our God is real.
Buddhism is a peaceful religion. In that way it is most honorable. But if their way is the true way, then I would think God would have them evangelizing and taking great risks with their human side to help others achieve the eternal.
Buddhism seems to be all about avoiding suffering, whereas Christianity is all about embracing suffering for a higher cause.
I believe all men can get to heaven, even all those who are of other religions and reject Christian teaching. But I also believe there are great graces they are not allowed being outside of the one true Church.