There are doctrinal problems contrary to plainly-and-simply-understood Bible verses pertaining to the reliable and non-changing nature of God the Creator and both fixed and perfectly-consistent characteristics of all that He has created and impeccably-consistently maintains involving and against claims of slightly-or-significantly-decreasing light-speed velocity and universal gravitational-force gradually weakening.
The claim for our consideration does not relate to varying distances and amounts of "mass" interacting in acceleration or deceleration from one another, but regarding the intrinsic field force emanating from each "particle" (or better yet: field) of mass itself.
Besides the crucial doctrinal disparities concerning claims of variable light speed and intrinsic gravitational force, the are common-sense impossibilities and absurdities also.
To illustrate, IF it were possible to "travel" (or: go) back in time and alter even the slightest historical event already recorded as history in human memory and various types of preserved-record media, EVERYTHING in EXISTENCE - of NECESSITY - would ALSO change (ALL being INTERDEPENDENT)...however slightly or grossly.
IF the velocity of light was EVEN SLIGHTLY different than what is was and has been at ANY point in the past, ALL past observations of SPACE and TIME PLUS the ENTIRETY of ALL events occurring therein would be somewhat or drastically altered contrary to having-already-occurred history and historical records.
ANY supposed even-"slight" change in either "c" (the always-has-been/always-is-now/always-will-be velocity of light) along with similarly-"slight" change in the extent and amount and duration of universal gravitational force would have both IMMEDIATE and CUMULATIVE dire and catastrophic effect, clearly resulting in soon-to-inevitable annihilation of or against humanity.
Thus, ALREADY-recorded events in the Bible would, of necessity, be subject to CONFUSING and UNCERTAIN alteration as to EXACTLY WHEN and WHERE and UNDER WHAT PRECISE CONDITIONS they in fact occurred.
Consider the creation of "stars" on the FOURTH Day of Creation Week as recorded in Genesis chapter 1.
Assuming (NOT "presuming") - logically - that light speed remained constant in attempting to explain how and why we now observe mere "starlight" from assumed mega-million/billion-light-years-distant stars and galaxies they are thought to have and perhaps or probably yet do emanate from, substantiation for created-in-transit constant-velocity starlight (assumed related to their mega-million/billion-light-years-distant stars and galaxies) is NEITHER "phony" nor "deceptive" -- because the ongoing and constantly-incoming starlight assumed to be associated with such assumed-to-yet-exist stars and galaxies gives us human observers TRUTHFUL and REAL incoming and ongoing info which is neither "fake" nor "imaginary."
The fallen and sinful corruption of humanity, from the Garden of Eden on, has not, does not, and cannot alter the immutable non-changing and non-changeable will and intents of God the Sovereign Creator, even and especially related to His PERFECTLY-constant-and-consistent light-speed velocity and NON-deteriorating universal gravitational force.
Psalm 74:17 You have fixed all the bounds of the Earth; you have made summer and winter.
Psalm 119:89 Forever, Lord, your Word is firmly fixed in the heavens.
Psalm 148:6 And He established them forever; He fixed their bounds which cannot be passed.
Jeremiah 31:35 Thus says the Lord, who gives the Sun for light by day and the fixed order of the Moon and the stars for light by night, who stirs up the sea so that its waves roar -- Lord of hosts is his name:
Jeremiah 31:36 “If this fixed order leaves me," says the Lord, "then shall the descendants of Israel cease from being a nation before me forever.”
Malachi 3:6 “I the Lord do not change; therefore you, sons of Jacob, are not consumed."
Acts 1:7 He said to them: “It is not for you to know times or seasons which the Father has fixed by His own authority."
Acts 17:31 ...because He has fixed a Day on which He will judge the world in righteousness by a Man whom He has appointed, and of this He has given assurance to all humans by raising Him from the dead.”
Second Timothy 2:13 ...if we are faithless, He remains faithful, because He does not deny himself.
Hebrews 13:8 Jesus Christ is the same yesterday, and today, and forever.
Human calendars (such as the Gregorian) are inaccurate concoctions which ultimately partition years, months, weeks, days, hours, minutes, and seconds somewhat inaccurately -- so much so that every so often a "leap day" is added to the month of February.
Thus, their wrong definition of what even a "second" is in terms of duration is a bit too short.
But God's awesome time-and-space-measurable-and-measured order is perfectly FIXED, IMMUTABLE, and COMPLETELY DEPENDABLE!
Such is consistent with the logical and accurate conclusion that God created everything in ADULT or ALREADY-COMPLETELY-FUNCTIONING form, such as tree seeds, sprouting tree seeds, budding trees emerging out of the ground, already-grown trees, non-birthed and already-fully-functioning Adam and fully-functioning Eve (probably BOTH created with "belly-button" navels). Thus, the anti-young-Earth heresy of http://godandscience.org is adequately refuted.