Baha'i is not jew, christian and muslim at the same time.
in my post I thought about whether it is possible to say "I am both a Jew, a Christian and a Muslim" if someone ask you "what is your religion"? or "What do you believe"?
Baha'u'llah offeres that we make no distinction between the Messengers.
Muhammad also offered that His Message was the Message of all the Prophets.
So in a spiritual sense, to follow One is to follow them all. That does not mean that one has to practice abrogated laws.
Yes but baha'i believe Baha'u'llah writings is most important now
It is seen they are given for this age, so yes they are the most suited for this age.
Many aspects of God's Messages do not change, some aspects do.
Regards Tony