wafflehead sure there are aspects of rational thought in other religions. No one has a monopoly on rationality even Mohammad made one of the pillars of islam to give alms to the poor.
The question one needs to answer is there truth, the relationship between what you believe and the reality you see or experience.
Now I am not picking on Buddhism in particular I thought I would choose it as it should be safe with me on ddzx ignore list the reems of babbling we can safely say we should dodge.
Buddha struggled with suffering and he wanted to eliviate it. Sounds pretty rational but one must square this rationality and his approach with truth that you see.
The opening line in the Buddhist scriptures is every life is paying its karma for its previous birth. Buddhism is nontheistic therefore can it be looked upon as an ethical theory about how to be good without a God. You can have goodness without God and the answer is in you, through buddhas Eightfold Path.
So if we adopt the approach of a reductio ad absurdum argument against Buddhism and accept this one aspect that there is really no God. How does one define goodness as you come back from reincarnation? Where does goodness come from? What really is evil? Buddha although rational in many areas and I highly respect him for his great desire to eliminate suffering from man. Buddha still doesnt answer all the questions it generates even from within its own belief system.
If we look at another aspect using rational thought Buddism tells you that you have an infinite series of rebirths. If there is an infinite series of rebirths infinity is therefore uncountable. But if Buddha attained nirvana then it must be countable you immediately begin to see the contradiction. Now a contradiction clashes with reality, it is not a different perspective on the same event it directly opposes the previous truth statement.
Apart from obvious contradictions it is also the questions and answers that a religion provides.
Christianity is unique in the questions and answers it gives. Those A are there for you to discover if the Q's have ever troubled you, study the gospels and you will find them.
But as a very succinct summary of the differences between the followers of Jesus Christ and other religions.
I will leave it to C S Lewis,
'the difference between Christianity and other religions.... Oh that is easy, it is Grace.'
