This a interesting question. Let me clarify my personal religious position before I give my research. I'm a Christian (from gentile background). There is no Jewish blood in me (as far as my knowledge goes).
As a Christian, I also read the Torah. And there was I time in my life that I tried to uphold the commandments from the Torah.
I'm giving examples from Jewish history to argue this point. And this is what I read in the Christian version of the history, as it's recorded in the book we call the Old Testament.
God gave a law to prevent his people to marry gentiles. The purpose for this law is to prevent the Israelites to fall into idolatry. See Deut 7:3-4
Ahab married Jezebel, an gentile who encouraged the worship of Baal. I Kings 16:29-34
Solomon married lots of heathen women, for political reasons. Yet he also started to serve the idols of his foreign wives. Because of this the kingdom divided in the Northern Kingdom and Southern Kingdom. This is one of the best examples that God was not pleased with his disregard of the law not to marry gentiles.
Nehemiah made it very clear that marrying gentiles led to idolatry. He also referred to Solomon. Neh 13:23-27
Yet there are two exceptions to the rule. Ruth and Rehab. Both were gentile women and both married Israelite men. Ruth's statement clarified why she was a well respected women within Bethlehem. Your God, is my God. (Ruth 1:16) This is a statement of faith, in the God of Abraham, Isaac and Jacob. We read nowhere a similar statement from Rehab. But through God's mercy, Rehab survived the commandment that everybody in Jerigo should be killed.
The law clearly said that no Moabite may become part of God's people. Yet, Ruth were the great-grandmother of David. Rehab is also one of David's ancestors.
Esther, as another example married a gentile king. God used her in this position to save her people from execution.
When the Hebrews left Egypt, there were Egyptians who joined them and became part of them.
Although God commanded his people not to marry gentiles, there were the exception where God blessed the marriage between a Jew and a gentile.
How should you make the distinction whether it's good to marry someone from a different faith that yours? My best advice is to discuss it with one of the rabbi's you trust, asking questions about these accepted gentile women and the commandment about idolatry.