Didn't you read Romans?
What does Romans 1:19-20 mean to you??
1. A person living in 1400 in No. America could look up at the sky and know that there must be a being bigger than himself. He could come to believe in God just from the creation. He could come to worship God.
(and, just like right now, another person would not).
A person living near Notre Dame in Paris in 1400 has the same opportunity.
It would be maybe by hearing...or maybe not. It might still be creation that convinces them...
it's always the Holy Spirit working.
2. Muslims. Right. Well, if a person is a Muslim and he loves God and worships Him, he is most probably saved.
You see A, there's only One God. If a person is worshipping the correct God (not Buddha). then he is also worshipping Jesus because Jesus is God. God is our savior.
Isaiah 12:2
2“Behold, God is my salvation,
I will trust and not be afraid;
For the LORD GOD is my strength and song,
And He has become my salvation.”
Don't you believe in a sovereign God?
God is sovereign and powerful.
He could do what He wishes.
For God everything is possible.