501c3 doesn't force churches to signup. The 501c3 guidelines clearly say: The IRS also prevents organizations (even churches) from making official ties to political campaigns including candidate endorsements. 501c3 is under government control. If you sell your church out to the government, don't be shocked when the government exercises it's control over you, they pay for you.
No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon. Matthew 6:24