Its certainly more than just Evangelicals and even within Catholicism there isn't broad agreement (even though it is more open to the idea of implicit faith).

In Catholic teaching, the Catechism (1260‑1261) leaves room for “invincible ignorance,” meaning that people who never hear the Gospel through no fault of their own may still be saved. Past papal statements (e.g., John Paul II’s Redemptor Hominis, Benedict XVI’s Dominus Iesus) reinforce this inclusive possibility, even while affirming that baptism and conscious assent remain the ordinary means of salvation. Surveys of Western Catholics show some acceptance of this view: a 2015 Pew Research Center poll of U.S. adults found that roughly 38 % of self‑identified Catholics agreed that “people of other religions can go to heaven.” Similar European Catholic surveys report figures ranging from 30 % to 45 %, indicating a sizable minority that embraces an inclusive outlook.

Among Protestants, the dominant doctrine of sola fide (faith alone) stresses that personal trust in Christ is the exclusive gateway to eternal life. While some Reformed or liberal evangelical circles entertain concepts like “anonymous Christians” or God’s mysterious mercy, these ideas are not mainstream. Pew’s 2014 study of U.S. Protestants showed that only about 15 % endorsed the statement that “people of other religions can go to heaven,” with higher agreement among mainline denominations (≈20 %) and lower among evangelical/conservative groups (≈10 %).

Generally speaking its a minority of Christians that believe non Christians can go to heaven, especially among Protestants.