My marriage is near..but i want to postpone it..i am afraid whether it will work out..?

Are you marrying the parents? Nope, you need to marry how you and your bf wants it. You have a Hindu ceremony for the wedding. You have a Christian Baptism for your first child. Or, you have both ceremonies as I have seen it in a movie once. You will be fine. Do not worry. This is your life. If you one day decide not to be Hindu you can be a Christian. If you decide not to be a Christian and stay as a Hindu than that's your choice. Both parents need to remember love and patience for their child's happiness. Enjoy your wedding day.