Methodist/Presbyterian/Lutheran/Baptist etc are just diff denominations.. we are all Christian. Just that it's diff system of church leadership - for example, Presbyterian churches are led by a panel of elected congregation members called elders and deacons. Whereas Methodist are led by a bishop. It's all just semantics la. There is also some difference in the focus of teachings in the denominations... that's all. Same Bible, same God, same belief, same faith
About the marriage issue - a Christian who is strong in the faith and rooted in church is not likely to go ahead with a mixed-religion marriage. If your FH is a laissez-faire Christian in the sense that he doesn't really go to church regularly, doesn't attend BS, and his faith is not an integral part of his life, then of course he would be more likely to be easy-going about your religion as well. But I think anyone who is dedicated to his/her religion would want someone who is also equally dedicated to the religion, because it would be such a basic and important part of their lives that it is very difficult when your spouse does not share these strong, basic beliefs.
Also of course the problem with bringing up children - do you bring them to church? Do you bring them to temple? Will your kids grow up religion-indifferent or unable to differentiate between diff religions? OR confused because their parents/grandparents will be pulling them in diff directions? Easy to say that you will let your kids choose but often you or your parents or PIL will try and influence their choice.
For me, my dad's a pastor. I was brought up Christian but I left the church in Sec 3. Until I reached uni I was quite anti-Christian and angry at Christianity. Then I made my own choice and my parents, wonderful people that they are, stayed quiet that I might make my own decision without any pressure. Finally when I turned 21 I came back to church by myself. I have friends who have converted from Hinduism to Christianity, some converted from Christianity to Buddhism, some from Buddhism to Islam. It is a personal choice you have to make but if you intend for your children to make that choice, then you have to be very clear with your spouse beforehand, and with your parents-in-law too. If you have no objection that your kids go to church, then let them go...I agree that it is good to instill discipline and morals in them. Doesn't mean that they will turn out Christian...you can request that your children NOT be baptized.