One of the many ways how God "talk" to His prophets,
Acts 14:3
So Paul and Barnabas spent considerable time there, speaking boldly for the Lord, who confirmed the message of his grace by enabling them to perform signs and wonders.
This is one of His typical ways for unambigous communication, that is, the using of miracles. After signifying a message, followed is a miracle/sign/wonder closely related to the message being performed (automatically or under the request of the messenger).
Another example,
God asked Moses to lead his fellow Jews to crose the Red Sea. Moses was confused as it seemed that there was no way they could go across the sea. Moses thus requested for a confirmation of His command/message. Moses then was asked to point his staff to the sea. Then the miracle performed to confirm His own message is the separation of the Red Sea.
As a result...
I have to believe in Christianity because (one of reasons and events) somehow I was allowed to get to know this communication stuff....actually before I got to know what Christianity is (another example of a persuasive way of doing things in a futuric manner).
a quote of my own post on page 1 of this same thread,
However, God can communicate more unambigiously and more specific in a way that, somehow, future is involved. That's why whenever you hear the stories of the prophets, you hear prophecies. Prophecies have all to do with communicating with God. On the other hand He can only be reached when He wishes to communicate with you.