The best thing to do is marry another Christian, somebody who shares a similar worldview. To marry somebody from a different religious or a secular background is not recommended because he or she could pose a great threat to one's own spiritual life--though it is not an absolute command (1 Corinthians 7:12-14; 1 Peter 3:1-6). Marrying an unbeliever is unwise, to say the least.
We need to stop judging people by worldly factors such as physical appearance, charm, intellect, and wealth. Neither should one choose a spouse on the basis of a mere profession of faith in the Lord Jesus Christ (Matthew 7:21). What a person should be looking at in a potential spouse is their overall doctrine, state of heart, and personality. Thus, it is better to suffer from the pains of loneliness than to make the poor decision of marrying the wrong person!
Some people may have to wait a long time before finally getting married, like Isaac who was forty before he got married (Genesis 25:20). In fact, not everybody has been called to live a married life. Even Christ spoke of the celibate (Matthew 19:11-12).
"...although divorce is always the result of sin, divorce in itself is not always a sin, and not everyone in a divorce situation is guilty of sin. Matthew 19:9 gives us one case in which divorce is allowable: sexual immorality. This term translates the Greek word porneia, which can cover a wide variety of sexual sins and not just a physical relationship between a person and another who is not his or her spouse. Repeated, impenitent sexual sin is proper grounds upon which the injured spouse may seek a biblical divorce. Paul gives the other grounds for a biblically permissible divorce—desertion on the part of an unbeliever (1 Cor. 7:10–16). A Christian married to an unbeliever is free to remarry if the unbeliever wants out of the marriage. In both cases, it is imperative that good and godly elders are prepared to deal with the multitude of complexities that can arise when one spouse seeks a divorce. They must be able to discern when actual sexual sin has been committed, when a professing believer has actually proven himself an unbeliever through impenitent spousal abuse, and much more if they are going to accurately discern whether a divorce is biblically acceptable in a particular situation." (https://www.ligonier.org/learn/devotionals/when-god-allows-divorce/)