To believe means to accept something as true, to think that something exists, to have trust or be confident that somebody or something is worthwhile or effective. Religiously, belief is a much stronger stake in something than believing that, for example, it’s going to rain tomorrow.
Anyone who states that he believes in Jesus Christ sets himself up for ridicule. After all, Jesus claimed to be God. Non-Christians must consider that claim to be preposterous, right? Furthermore, Jesus asserted that He could forgive our sins. He testified that He, and only He, is the way, the truth, and the life, thus negating each and every other religious faith. Christians are, by their belief in Christ, confirming that all other religions are false. Hence the ridicule and discrimination against us.
I was recently shocked to hear a Protestant pastor say that he worried sometimes that he hasn’t done enough and when “the trumpet blows” he might not hear it and miss out! Where is his belief? And doesn’t he know that he doesn’t have to “do” anything? Salvation is a free gift; you just need to believe in Jesus. Period.